answer

来源: student99 于 2014-03-11 20:15:36 [] [旧帖] [给我悄悄话] 阅读数 : (118 bytes)
回答: help math question 由 FMX 于 2014-03-11 17:56:39

Is 10 choose 5. basically, you need to choose 5 different digits, and there is only one way to order it decreasing ly.

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