![4个人每两人握一次手,共要握______次手;若这4人要站在一起照相,共有______种站法.-]()
1、4个人每两人握一次手,共要握______次手;若这4人要站在一起照相,共有______种站法.-
答:[答案] (1)(4-1)*4÷2, =12÷2, =6(次); (2)4*3*2*1=24(种); 答:4个人每两人握一次手,共要握6次手;若这4人要站在一起照相,共有24种站法. 故答案为:6,24.
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