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标题: GWD-9-Q13 [打印本页]

作者: hedgeforfun 时间: 2006-6-19 13:17 标题: GWD-9-Q13

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

A 6

B.60

C.120

D.360

E.720

The answer is B. Does anyone know how to figure it out? Tks.

作者: bobiouou 时间: 2006-6-20 06:38

P(6,6)/(P(2,2)*P(3,3))

作者: hedgeforfun 时间: 2006-6-23 20:35

thanks !~~~~~~~~

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