阿Q吧 > 排列组合的公式怎么展开

排列组合的公式怎么展开

2025-04-06 21:40:02
推荐回答（2个）
回答1：

比如P5＝5*4*3*2*1,P7=7*6*5*4*3*2*1
5p3=5*4*3(乘三个）8P4=8*7*6*5（乘4个）
nCn=1(n取任何自然数）nC0=1
4C2=P4/P2 8C4=P8/P4。。。。。

Pn=n!

回答2：

A3/4=4*3*2
看看书上的例题就知道了哦

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