回复:希望你能详细解释一下, 对此我将不胜感谢。
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jinjing
于
2005-02-03 07:40:56
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all socks and shoes are 16.The permutation is 16!.But only half for one leg is ok.For 8 legs only 1/2^8 is ok.So it is 16!/256.If same leg put on together,the anwser should be 8!.