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每两个人握一次手四个人一共要握几次
更新时间: 2021-01-28 03:25:24  

一共6次。

1、给四个人编号,分别为A、B、C、D;

2、A分别与BCD握手,共3次;

3、B分别与CD握手,共2次;

4、C与D握手,共1次;

5、加起来就是3+2+1=6次。

注意的点:“A和B握手”与“B和A握手”只能算一次,所以用公式法可以这么算:四个人,每个人跟另外三个人握手,就是4*3,但是这样每两个人多算了一次,要除以2,就是4*3/2=6。

关键词: 个人 一共

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