{"id":1087,"date":"2025-12-24T17:20:36","date_gmt":"2025-12-24T08:20:36","guid":{"rendered":"https:\/\/math-travel.com\/?p=1087"},"modified":"2026-02-11T17:02:07","modified_gmt":"2026-02-11T08:02:07","slug":"enjunretu","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-a\/enjunretu\/","title":{"rendered":"\u5186\u9806\u5217\u306e\u516c\u5f0f\u3068\u6c42\u3081\u65b9\uff01\u306a\u305c\u300cn-1\u300d\u3092\u3059\u308b\u306e\u304b\uff1f\u56f3\u89e3\u3067\u7406\u7531\u304c\u30b9\u30c3\u30ad\u30ea\u308f\u304b\u308b"},"content":{"rendered":"\n

\u300c\u5186\u9806\u5217\u306e\u516c\u5f0f\u304c\u77e5\u308a\u305f\u3044\u300d<\/span>
\u300c\u516c\u5f0f\u306e\u610f\u5473\u304c\u77e5\u308a\u305f\u3044\u300d<\/span><\/p>\n\n\n\n

\u4eca\u56de\u306f\u5186\u9806\u5217\u306b\u95a2\u3059\u308b\u3053\u3093\u306a\u60a9\u307f\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\n\n\n

\"\"\u9ad8\u6821\u751f<\/span><\/div>
\n

\u5186\u9806\u5217\u304c\u82e6\u624b\u3067\u3059\u2026<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u4eca\u56de\u306f\u9806\u5217\u306e\u306a\u304b\u3067\u3082\u5186\u9806\u5217\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u3055\u3063\u305d\u304f\u3067\u3059\u304c\u4ee5\u4e0b\u306e\u554f\u984c\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n

\n
\"\u5186\u9806\u5217\u30005\u4eba\u306e\u5ea7\u308a\u65b9\"<\/figure>\n<\/div>\n\n\n
\u5186\u9806\u5217\u3000\u4f8b\u984c<\/span><\/div>
\n

\u4e21\u89aa2\u4eba\u3068\u5b50\u4f9b3\u4eba\uff08\u305f\u304b\u3057\u3001\u3042\u304d\u3089\u3001\u3086\u3046\u304d\uff09\u304c\u5186\u5f62\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5ea7\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u3053\u306e\u3068\u304d5\u4eba\u5168\u4f53\u306e\u5ea7\u308a\u65b9\u306f\u4f55\u901a\u308a\u3042\u308a\u307e\u3059\u304b\u3002<\/p>\n<\/div><\/div>\n\n\n\n

\u3053\u308c\u304c\u5186\u9806\u5217<\/span>\u306e\u554f\u984c\u3067\u3059\u3002<\/p>\n\n\n\n

\u7d50\u8ad6\u304b\u3089\u3044\u3046\u3068\u3001\u3053\u306e\u554f\u984c\u306f<\/p>\n\n\n\n

\\[\\left(5-1\\right)!=24\\]<\/p>\n\n\n\n

\u3068\u306a\u308a\u300124\u901a\u308a\u3060\u3068\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\u672c\u8a18\u4e8b\u3067\u306f\u5186\u9806\u5217\u306e\u516c\u5f0f\u3068\u610f\u5473\u306b\u3064\u3044\u3066\u89e3\u8aac<\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u5f8c\u534a\u3067\u306f\u5186\u9806\u5217\u306e\u554f\u984c\u89e3\u8aac\u3092\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u6700\u5f8c\u307e\u3067\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n

\u5186\u9806\u5217\u306e\u516c\u5f0f<\/h2>\n\n\n\n

\u5186\u9806\u5217\u3068\u306f\u540d\u524d\u306e\u901a\u308a\u5186\u306e\u9806\u5217<\/span>\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u5186\u9806\u5217\u306e\u516c\u5f0f\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u5186\u9806\u5217\u306e\u516c\u5f0f<\/span><\/div>
\n

\u7570\u306a\u308b\\(n\\)\u500b\u306e\u3082\u306e\u3092\u5186\u5f62\u306b\u4e26\u3079\u308b\u3068\u304d\u306e\u4e26\u3079\u65b9\u306e\u7dcf\u6570<\/p>\n\n\n\n

\\[\\left(n-1\\right)!\\]<\/p>\n<\/div><\/div>\n\n\n\n

\u4eba\u304c\u5186\u5f62\u30c6\u30fc\u30d6\u30eb\u306b\u5ea7\u308b\u554f\u984c\u3084\u3001\u8f2a\u306e\u5f62\u306b\u4e26\u3076\u554f\u984c\u304c\u591a\u3044\u3067\u3059\u306d\u3002<\/p>\n\n\n\n

\u5186\u9806\u5217\u3068\u9806\u5217\u306e\u9055\u3044<\/h2>\n\n\n\n

\u5186\u9806\u5217\u3068\u9806\u5217\u306e\u9055\u3044\u306f\u4e26\u3079\u65b9\u306e\u9055\u3044\u3067\u3059\u3002<\/p>\n\n\n\n

\u9806\u5217\u306f1\u5217\u306b\u307e\u3063\u3059\u3050\u4e26\u3079\u3066\u3044\u304f\u306e\u306b\u5bfe\u3057\u3066\u3001\u5186\u9806\u5217\u306f\u5186\u72b6\u306b\u4e26\u3079\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u5186\u9806\u5217\u3068\u9806\u5217\u306e\u9055\u3044\"<\/figure>\n<\/div>\n\n\n

\u305f\u3060\u3057\u3001\u5168\u3066\u306e\u9806\u5217\u306e\u554f\u984c\u304c1\u5217\u306b\u4e26\u3079\u308b\u3068\u306f\u9650\u3089\u306a\u3044\u306e\u3067\u3001\u3042\u304f\u307e\u3067\u30a4\u30e1\u30fc\u30b8\u3068\u3057\u3066\u7406\u89e3\u3057\u3066\u304a\u304f\u306e\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n

\"\"\u9ad8\u6821\u751f<\/span><\/div>
\n

\u5186\u5f62\u306b\u4e26\u3079\u3066\u3044\u305f\u3089\u5186\u9806\u5217\u3067\u3059\u306d\uff01<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u5186\u9806\u5217\u306e\u516c\u5f0f\u306e\u610f\u5473<\/h2>\n\n\n\n

\u305f\u3060\u306e\u9806\u5217\u3067\u306f\u3001\u7570\u306a\u308bn\u500b\u306e\u3082\u306e\u3092\u4e26\u3079\u308b\u3068\u304d\u306e\u4e26\u3079\u65b9\u306f\\(n!\\)\u3067\u3057\u305f\u306d\u3002<\/p>\n\n\n\n

\u305d\u308c\u306b\u5bfe\u3057\u3066\u3001\u5186\u9806\u5217\u3067\u306f<\/p>\n\n\n\n

\\[(n-1)!\\]<\/p>\n\n\n\n

\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n

\"\"\u9ad8\u6821\u751f<\/span><\/div>
\n

\u306a\u306b\u304b\u30921\u3064\u6e1b\u3089\u3057\u305f\u3063\u3066\u3053\u3068\uff1f<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n

\"\"\u30b7\u30fc\u30bf<\/span><\/div>
\n

\u826f\u3044\u3068\u3053\u308d\u306b\u6c17\u304c\u4ed8\u3044\u305f\u306d\uff01\uff01<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u4e21\u89aa\u4e8c\u4eba\u3068\u5b50\u4f9b3\u4eba\uff08\u305f\u304b\u3057\u3001\u3042\u304d\u3089\u3001\u3086\u3046\u304d\uff09\u304c\u5186\u5f62\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5ea7\u3063\u305f\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u305d\u306e\u4e2d\u306e\uff11\u3064\u306e\u4e26\u3073\u65b9\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u5ea7\u308a\u65b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u3000\u5186\u9806\u5217\u30005\u4eba\u306e\u5ea7\u308a\u65b9\"<\/figure>\n<\/div>\n\n\n

\u6b21\u306b\u3053\u3061\u3089\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n

\n
\"\u5186\u9806\u5217\u30005\u4eba\u306e\u5ea7\u308a\u65b9\"<\/figure>\n<\/div>\n\n\n

\u5b9f\u306f\u3053\u306e2\u3064\u306e\u5ea7\u308a\u65b9\u306f\u3001\u898b\u308b\u5411\u304d\u3092\u5909\u3048\u305f\u3060\u3051\u3067\u3069\u3061\u3089\u3082\u540c\u3058\u4e26\u3073\u65b9\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

\u4ed6\u306b\u3082\u540c\u3058\u4e26\u3073\u65b9\u3068\u306a\u308b\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n

\n
\"\u5186\u9806\u5217\u30005\u4eba\u306e\u5ea7\u308a\u65b9\"<\/figure>\n<\/div>\n\n\n

\u3064\u307e\u308a\u3001\u5186\u9806\u5217\u3092\u9806\u5217\u3068\u540c\u3058\u304f\\(5!\\)\u3068\u3057\u3066\u3057\u307e\u3046\u3068\u540c\u3058\u5ea7\u308a\u65b9\u3092\u4f55\u5ea6\u3082\u6570\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u305d\u3053\u3067\u3072\u3068\u5de5\u592b\u3057\u305f\u306e\u304c\u5186\u9806\u5217\u306e\u516c\u5f0f<\/span>\u3067\u3059\u3002<\/p>\n\n\n\n

\u5186\u9806\u5217\u3092\u8003\u3048\u308b\u3068\u304d\u306f\u57fa\u6e96\u3068\u306a\u308b\u3082\u306e\u30921\u3064\u6c7a\u3081\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n\n\n\n

\u4eca\u56de\u306f\u4f8b\u3068\u3057\u3066\u3042\u304d\u3089\u3055\u3093\u3092\u57fa\u6e96\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u3042\u304d\u3089\u3055\u3093\u3092\u5148\u982d\u306b\u3057\u305f\u9806\u5217\u3092\u8003\u3048\u3001\u305d\u306e\u307e\u307e\u5186\u5f62\u306b\u5ea7\u308b\u3053\u3068\u3067\u5ea7\u308a\u65b9\u306e\u91cd\u8907\u304c\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u5186\u9806\u5217\u30005\u4eba\u306e\u5ea7\u308a\u65b9\"<\/figure>\n<\/div>\n\n\n

\u3057\u305f\u304c\u3063\u3066\u3001\u4eca\u56de\u306e\u554f\u984c\u3067\u306f\u57fa\u6e96\u3068\u3057\u305f\u3042\u304d\u3089\u3055\u3093\u3092\u9664\u304f4\u4eba\u306e\u9806\u5217\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\\[\\left(5-1\\right)!=24\\]<\/p>\n\n\n\n

\u3088\u3063\u3066\u30015\u4eba\u3067\u5186\u5f62\u30c6\u30fc\u30d6\u30eb\u306b\u5ea7\u308b\u3068\u304d\u306e\u5ea7\u308a\u65b9\u306f24\u901a\u308a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u4f8b\u984c\u306e\u3088\u3046\u306b\u3001\u5186\u9806\u5217\u3067\u306f1\u3064\u3092\u57fa\u6e96\u3068\u3057\u3066\u6b8b\u308a\u306e\u9806\u5217\u3092\u8003\u3048\u308b\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u516c\u5f0f\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n

\u5186\u9806\u5217\u306e\u516c\u5f0f<\/span><\/div>
\n

\u7570\u306a\u308b\\(n\\)\u500b\u306e\u3082\u306e\u3092\u5186\u5f62\u306b\u4e26\u3079\u308b\u3068\u304d\u306e\u4e26\u3079\u65b9\u306e\u7dcf\u6570<\/p>\n\n\n\n

\\[\\left(n-1\\right)!\\]<\/p>\n<\/div><\/div>\n\n\n

\"\"\u9ad8\u6821\u751f<\/span><\/div>
\n

\u306a\u308b\u307b\u3069\uff01\u3060\u304b\u30891\u5f15\u304f\u306e\u3067\u3059\u306d\uff01<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u5186\u9806\u5217\u306e\u554f\u984c<\/h2>\n\n\n\n

\u5186\u9806\u5217\u306f\u3001\u5186\u5f62\u30c6\u30fc\u30d6\u30eb\u306e\u554f\u984c<\/span>\u304c\u975e\u5e38\u306b\u591a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n

\u5186\u9806\u5217\u306e\u554f\u984c<\/span><\/div>
\n

\u5186\u5f62\u30c6\u30fc\u30d6\u30eb\u306e\u554f\u984c\u306e\u306a\u304b\u3067\u3082\u3001<\/p>\n\n\n\n

    \n
  • \u5927\u4eba\u3068\u5b50\u3069\u3082\u3067\u5ea7\u308b\u554f\u984c<\/li>\n\n\n\n
  • \u4ea4\u4e92\u306b\u5ea7\u308b\u554f\u984c<\/li>\n\n\n\n
  • \u96a3\u308a\u5408\u3046\u554f\u984c\u3000\u306a\u3069<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n

    \u69d8\u3005\u306a\u554f\u984c\u304c\u3042\u308a\u96e3\u3057\u305d\u3046\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u610f\u5916\u3068\u305d\u3093\u306a\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n

    \u8003\u3048\u65b9\u306f\u9806\u5217\u306e\u3068\u304d\u3068\u4f3c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

    \u30c6\u30fc\u30d6\u30eb\u3092\u56f2\u3080\u554f\u984c<\/h3>\n\n\n\n
    \u30c6\u30fc\u30d6\u30eb\u3092\u56f2\u3080\u554f\u984c<\/span><\/div>
    \n

    5\u4eba\u3067\u5186\u5f62\u30c6\u30fc\u30d6\u30eb\u306b\u5ea7\u308b\u3068\u304d\u3001\u5ea7\u308a\u65b9\u306f\u4f55\u901a\u308a\u3042\u308a\u307e\u3059\u304b\uff1f<\/p>\n<\/div><\/div>\n\n\n\n

    \u3053\u308c\u306f\u8d85\u57fa\u672c\u3068\u306a\u308b\u5186\u9806\u5217\u306e\u554f\u984c\u3067\u3059\u3002<\/p>\n\n\n\n

    \\begin{eqnarray}
    (5-1)!&=&4!\\\\
    &=&24
    \\end{eqnarray}<\/p>\n\n\n\n

    \u3057\u305f\u304c\u3063\u3066\u300124\u901a\u308a\u3060\u3068\u5206\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n

    \"\"\u30b7\u30fc\u30bf<\/span><\/div>
    \n

    \u5186\u9806\u5217\u306e\u57fa\u672c\u554f\u984c\u3060\u306d<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n

    \"\"\u9ad8\u6821\u751f<\/span><\/div>
    \n

    \u3053\u308c\u306f\u3067\u304d\u307e\u3057\u305f\uff01<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

    \u4ea4\u4e92\u306b\u5ea7\u308b\u554f\u984c<\/h3>\n\n\n\n
    \u4ea4\u4e92\u306b\u5ea7\u308b\u554f\u984c<\/span><\/div>
    \n

    \u5927\u4eba5\u4eba\u3068\u5b50\u3069\u30825\u4eba\u304c\u8f2a\u306e\u5f62\u306b\u4e26\u3076\u3068\u304d\u3001\u5927\u4eba\u3068\u5b50\u3069\u3082\u304c\u4ea4\u4e92\u306b\u4e26\u3076\u4e26\u3073\u65b9\u306f\u4f55\u901a\u308a\u3042\u308a\u307e\u3059\u304b\uff1f<\/p>\n<\/div><\/div>\n\n\n\n

    \u3053\u308c\u306f\u5148\u306b\u5927\u4eba\u3092\u8f2a\u306e\u5f62\u306b\u4e26\u3079\u305f\u3042\u3068\u306b\u3001\u3059\u304d\u9593\u306b\u5b50\u3069\u3082\u3092\u4e26\u3079\u308b\u3068\u8003\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

    \u307e\u305a\u306f\u5927\u4eba\u3092\u5186\u72b6\u306b\u4e26\u3070\u305b\u308b\u306e\u3067\u3001<\/p>\n\n\n\n

    \\[(5-1)!=24\\]<\/p>\n\n\n\n

    \u6b21\u306b\u5b50\u3069\u3082\u3092\u5927\u4eba\u306e\u3059\u304d\u9593\u306b\u4e26\u3079\u307e\u3059\u3002<\/p>\n\n\n\n

    \u5b50\u3069\u3082\u30921\u5217\u306b\u4e26\u3079\u3066\u3001\u3059\u304d\u9593\u306b\u5165\u308c\u3066\u3044\u304f\u306e\u3067\u9806\u5217\u306e\u8003\u3048\u65b9\u3067\u3059\u3002<\/p>\n\n\n\n

    \\[5!=120\\]<\/p>\n\n\n\n

    \u3057\u305f\u304c\u3063\u3066\u3001\u6c42\u3081\u308b\u4e26\u3073\u65b9\u306f<\/p>\n\n\n\n

    \\[24 \\times 120 =2880\\]<\/p>\n\n\n\n

    \u3088\u3063\u3066\u30012880\u901a\u308a\u3060\u3068\u5206\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

    \u96a3\u308a\u5408\u3046\u554f\u984c<\/h3>\n\n\n\n
    \u96a3\u308a\u5408\u3046\u554f\u984c<\/span><\/div>
    \n

    \u7537\u5b504\u4eba\u3068\u5973\u5b502\u4eba\u304c\u30016\u4eba\u306e\u4e38\u3044\u30c6\u30fc\u30d6\u30eb\u306b\u5ea7\u308a\u307e\u3059\u3002\u5973\u5b50\u304c\u96a3\u308a\u5408\u3046\u4e26\u3073\u65b9\u306f\u4f55\u901a\u308a\u3042\u308a\u307e\u3059\u304b\uff1f<\/p>\n<\/div><\/div>\n\n\n\n

    \u96a3\u308a\u5408\u3046\u554f\u984c\u3068\u96a3\u308a\u5408\u308f\u306a\u3044\u554f\u984c\u306f\u9806\u5217\u3067\u3082\u3042\u308a\u307e\u3057\u305f\u306d\u3002<\/p>\n\n\n

    \n
    \"\u96a3\u308a\u5408\u3046\u30dd\u30a4\u30f3\u30c8\"<\/figure>\n<\/div>\n\n\n

    \u96a3\u308a\u5408\u3046\u554f\u984c\u3067\u306f\u3001\u96a3\u308a\u5408\u3046\u3082\u306e\u30921\u30bb\u30c3\u30c8<\/span>\u306b\u3057\u3066\u8003\u3048\u307e\u3059\u3002<\/p>\n\n\n\n

    \u3064\u307e\u308a\u3001\u4eca\u56de\u306e\u554f\u984c\u3067\u306f\u5973\u5b502\u4eba\u30921\u30bb\u30c3\u30c8\u3067\u8003\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n

    \n
    \"\"<\/figure>\n<\/div>\n\n\n

    \u3059\u308b\u3068\u3001\u5973\u5b501\u30bb\u30c3\u30c8\u3068\u7537\u5b504\u4eba\u306e\u5186\u9806\u5217\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \\[(5-1)!=24\\]<\/p>\n\n\n\n

    \u307e\u305f\u3001\u5973\u5b502\u4eba\u306e\u4e26\u3073\u66ff\u3048\u3082\u3042\u308b\u306e\u3067\u3001<\/p>\n\n\n\n

    \\[24 \\times 2 =48\\]<\/p>\n\n\n\n

    \u3057\u305f\u304c\u3063\u3066\u3001\u5973\u5b502\u4eba\u304c\u96a3\u308a\u5408\u3046\u4e26\u3073\u65b9\u306f48\u901a\u308a\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \u300a\u5fdc\u7528\u300b\u6570\u73e0\u9806\u5217<\/h2>\n\n\n
    \n
    \"\u3058\u3085\u305a\u9806\u5217\"<\/figure>\n<\/div>\n\n\n


    \u5186\u9806\u5217\u3068\u3042\u308f\u305b\u3066\u3058\u3085\u305a\u9806\u5217<\/span>\u306b\u3064\u3044\u3066\u3082\u77e5\u3063\u3066\u304a\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

    \u3058\u3085\u305a\u9806\u5217\u306e\u516c\u5f0f<\/span><\/div>
    \n

    \\(n\\)\u500b\u306e\u7570\u306a\u308b\u3082\u306e\u3067\u8f2a\u3092\u4f5c\u308b\u3068\u304d\u306e\u4e26\u3079\u65b9\u306e\u7dcf\u6570<\/p>\n\n\n\n

    \\[\\displaystyle \\frac{\\left(n-1\\right)!}{2}\\]<\/p>\n<\/div><\/div>\n\n\n\n

    \u5186\u9806\u5217\u306e\u516c\u5f0f\u30922\u3067\u5272\u308b\u3068\u3058\u3085\u305a\u9806\u5217\u306e\u516c\u5f0f\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \u3067\u306f\u3001\u3069\u3046\u3044\u3063\u305f\u554f\u984c\u304c\u3058\u3085\u305a\u9806\u5217\u306a\u306e\u304b\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

    \u3058\u3085\u305a\u9806\u5217\u306e\u4f8b\u984c<\/span><\/div>
    \n

    \u8272\u306e\u7570\u306a\u308b\u30d3\u30fc\u30ba5\u3064\u3092\u3059\u3079\u3066\u4f7f\u3063\u3066\u3001\u30d6\u30ec\u30b9\u30ec\u30c3\u30c8\u3092\u3064\u304f\u308a\u307e\u3059\u3002\u30d6\u30ec\u30b9\u30ec\u30c3\u30c8\u306f\u5168\u90e8\u3067\u4f55\u901a\u308a\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304b\u3002<\/p>\n<\/div><\/div>\n\n\n\n

    \u3053\u308c\u306f\u3058\u3085\u305a\u9806\u5217\u306e\u554f\u984c\u3067\u3059\u3002<\/p>\n\n\n\n

    \u8003\u3048\u65b9\u306f\u5186\u9806\u5217\u306e\u554f\u984c\u3068\u4f3c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

    \u307e\u305a\u306f5\u3064\u3092\u5186\u5f62\u306b\u4e26\u3079\u308b\u554f\u984c\u306a\u306e\u3067\u3001\\((5-1)!\\)\u901a\u308a<\/p>\n\n\n

    \n
    \"\u3058\u3085\u305a\u9806\u5217\"<\/figure>\n<\/div>\n\n\n

    \u5186\u9806\u5217\u306e\u554f\u984c\u3067\u306f\u3001\u4ee5\u4e0b\u306e2\u3064\u306e\u4e26\u3079\u65b9\u306f\u7570\u306a\u308b\u3082\u306e\u3067\u3059\u304c\u30d6\u30ec\u30b9\u30ec\u30c3\u30c8\u3068\u306a\u308b\u3068\u8a71\u306f\u5225\u3067\u3059\u3002<\/p>\n\n\n

    \n
    \"\u3058\u3085\u305a\u9806\u5217\"<\/figure>\n<\/div>\n\n\n

    \u30d6\u30ec\u30b9\u30ec\u30c3\u30c8\u306f\u88cf\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u3053\u306e\uff12\u3064\u306f\u540c\u3058\u3082\u306e\u3068\u3057\u3066\u6271\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

    \u8868\u3068\u88cf\u3092\u8003\u3048\u305f\u7d50\u679c\u3001\u30d6\u30ec\u30b9\u30ec\u30c3\u30c8\u306f\u5168\u90e8\u3067\\(\\displaystyle \\frac{(5-1)!}{2}\\)\u901a\u308a\u3042\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

    \u88cf\u8fd4\u3057\u305f\u3068\u304d\u306b\u91cd\u8907\u3059\u308b\u4e26\u3073\u65b9\u304c\u3042\u308b\u306e\u3067\u3001\u3058\u3085\u305a\u9806\u5217\u306e\u516c\u5f0f\u306f\\(\\displaystyle \\frac{(n-1)!}{2}\\)\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n

    \u5186\u9806\u5217\u300a\u7df4\u7fd2\u554f\u984c\u300b<\/h2>\n\n\n
    \n
    \"\u5186\u9806\u5217\uff1c\u7df4\u7fd2\u554f\u984c\uff1e\"<\/figure>\n<\/div>\n\n\n


    \u5186\u9806\u5217\u3092\u6c42\u3081\u308b\u7df4\u7fd2\u554f\u984c\u306b\u6311\u6226\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n

    \"\"\u30b7\u30fc\u30bf<\/span><\/div>
    \n

    \u516c\u5f0f\u3092\u601d\u3044\u51fa\u3057\u306a\u304c\u3089\u8003\u3048\u3066\u307f\u3088\u3046\uff01<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

    \u5186\u9806\u5217\u306e\u7df4\u7fd2\u554f\u984c1<\/h3>\n\n\n\n
    \u7df4\u7fd2\u554f\u984c1<\/span><\/div>
    \n

    4\u4eba\u3067\u5186\u5f62\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5ea7\u308b\u3068\u304d\u3001\u4f55\u901a\u308a\u306e\u5ea7\u308a\u65b9\u304c\u3042\u308a\u307e\u3059\u304b\u3002<\/p>\n<\/div><\/div>\n\n\n\n

    \u89e3\u8aac<\/span><\/p>\n\n\n\n

    \u3053\u308c\u306f\u5178\u578b\u7684\u306a\u5186\u9806\u5217\u306e\u554f\u984c\u306a\u306e\u3067\u3001\u5186\u9806\u5217\u306e\u516c\u5f0f\u306b\u5f53\u3066\u306f\u3081\u3066\u8003\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

    \\begin{eqnarray}
    (4-1)!&=&3!\\\\
    &=&6
    \\end{eqnarray}<\/p>\n\n\n\n

    \u3057\u305f\u304c\u3063\u3066\u30016\u901a\u308a\u3060\u3068\u5206\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

    \u5186\u9806\u5217\u306e\u7df4\u7fd2\u554f\u984c2<\/h3>\n\n\n\n
    \u7df4\u7fd2\u554f\u984c2<\/span><\/div>
    \n

    \u5927\u4eba2\u4eba\u3068\u5b50\u3069\u30824\u4eba\u304c\u3001\u5186\u5f62\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5ea7\u308b\u3068\u304d\u3001\u5927\u4eba2\u4eba\u304c\u5411\u304b\u3044\u5408\u3046\u5ea7\u308a\u65b9\u306f\u4f55\u901a\u308a\u3042\u308a\u307e\u3059\u304b\uff1f<\/p>\n<\/div><\/div>\n\n\n\n

    \u89e3\u8aac<\/span><\/p>\n\n\n\n

    \u5927\u4eba\u306e\u3069\u3061\u3089\u304b\u3092\u57fa\u6e96\u3068\u3059\u308b\u3068\u3001\u30b7\u30f3\u30d7\u30eb\u306b\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

    \u5927\u4eba1\u4eba\u3092\u57fa\u6e96\u3068\u3059\u308b\u3068\u3001\u3082\u30461\u4eba\u306e\u5927\u4eba\u306e\u4f4d\u7f6e\u304c\u6c7a\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n

    \n
    \"\u5186\u9806\u5217\u306e\u7df4\u7fd2\u554f\u984c1\"<\/figure>\n<\/div>\n\n\n

    \u3042\u3068\u306f\u5b50\u3069\u30824\u4eba\u306e\u9806\u5217\u3092\u8003\u3048\u308c\u3070\u3088\u3044\u306e\u3067\u3001<\/p>\n\n\n\n

    \\[4!=24\\]<\/p>\n\n\n

    \n
    \"\u5186\u9806\u5217\u306e\u7df4\u7fd2\u554f\u984c2\"<\/figure>\n<\/div>\n\n\n

    \u3057\u305f\u304c\u3063\u3066\u3001\u6c42\u3081\u305f\u3044\u5ea7\u308a\u65b9\u306f24\u901a\u308a\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \u5186\u9806\u5217\u306e\u516c\u5f0f\u3000\u307e\u3068\u3081<\/h2>\n\n\n\n

    \u4eca\u56de\u306f\u5186\u9806\u5217\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/span><\/p>\n\n\n\n

    \u5186\u9806\u5217\u306f\u4ee5\u4e0b\u306e\u516c\u5f0f\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n

    \u5186\u9806\u5217\u306e\u516c\u5f0f<\/span><\/div>
    \n

    \u7570\u306a\u308b\\(n\\)\u500b\u306e\u3082\u306e\u3092\u5186\u5f62\u306b\u4e26\u3079\u308b\u3068\u304d\u306e\u4e26\u3079\u65b9\u306e\u7dcf\u6570<\/p>\n\n\n\n

    \\[\\left(n-1\\right)!\\]<\/p>\n<\/div><\/div>\n\n\n\n

    \u5186\u9806\u5217\u306e\u8003\u3048\u65b9<\/span><\/div>
    \n

    \u5186\u9806\u5217\u306f\u57fa\u6e96\u3068\u306a\u308b\u3082\u306e\u3092\u6c7a\u3081\u308b\u3053\u3068\u3067\u3001\u9806\u5217\u306e\u554f\u984c\u3068\u3057\u3066\u8003\u3048\u3066\u3044\u308b\u3002<\/p>\n<\/div><\/div>\n\n\n\n

    \u4eca\u56de\u306f\u5186\u9806\u5217\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u304c\u3001\u305d\u306e\u4ed6\u306b\u3082\u91cd\u8981\u306a\u516c\u5f0f<\/span>\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u300c\u5186\u9806\u5217\u306e\u516c\u5f0f\u304c\u77e5\u308a\u305f\u3044\u300d\u300c\u516c\u5f0f\u306e\u610f\u5473\u304c\u77e5\u308a\u305f\u3044\u300d \u4eca\u56de\u306f\u5186\u9806\u5217\u306b\u95a2\u3059\u308b\u3053\u3093\u306a\u60a9\u307f\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002 \u4eca\u56de\u306f\u9806\u5217\u306e\u306a\u304b\u3067\u3082\u5186\u9806\u5217\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002 \u3055\u3063\u305d\u304f\u3067\u3059\u304c\u4ee5\u4e0b\u306e\u554f\u984c\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002 \u3053\u308c\u304c\u5186\u9806\u5217\u306e\u554f\u984c\u3067\u3059\u3002 \u7d50\u8ad6\u304b […]<\/p>\n","protected":false},"author":1,"featured_media":6868,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[15,223],"tags":[20,10,11],"class_list":["post-1087","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-number","category-math-a","tag-20","tag-a","tag-11"],"yoast_head":"\n\u5186\u9806\u5217\u306e\u516c\u5f0f\u3068\u6c42\u3081\u65b9\uff01\u306a\u305c\u300cn-1\u300d\u3092\u3059\u308b\u306e\u304b\uff1f\u56f3\u89e3\u3067\u7406\u7531\u304c\u30b9\u30c3\u30ad\u30ea\u308f\u304b\u308b<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/math-travel.jp\/math-a\/enjunretu\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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