证明 (nC0)+ (nC1)+(nC2).....(nCn-1)+(nCn) = 2^n
证明题。。。请帮帮忙
所有跟帖:
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有很多办法
-haha2000-
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(568 bytes)
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01/28/2009 postreply
06:08:50
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or you can simply count it, if your teacher does not
-idiot94-
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(43 bytes)
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01/29/2009 postreply
06:20:54
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回复:证明题。。。请帮帮忙
-chang2009-
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(49 bytes)
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01/31/2009 postreply
04:10:53