数原理1_2_1_1排列与排列数公式随堂达标验收新人教A版选修2_3.doc

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11-2-1-1 排列与排列数公式1 N *,且 12的最小正整数 n的值为_A7nA5n解析 12A7nA5nn! n 7 !n! n 5 ! n 5 ! n 7 !得:( n5)( n6)12.解得: n9或 n2(应舍去)最小正整数 n的值为 10.答案 102

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