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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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