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标题: 请教GWD9-- Math-Q13! [打印本页]

作者: bnbf 时间: 2005-3-10 12:59 标题: 请教GWD9-- Math-Q13!

The question is:

How many different 6-letter sequences are there that consist of 1A, 2B's, and 3C's?

A.6 B.60 C.120 D.360 E.720

Thank you in advance!

作者: mary1 时间: 2005-3-10 13:06

p66/ p22*p33

作者: bnbf 时间: 2005-3-11 12:30

thanks!!

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