13How 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(答案是B)
37/A club with a total membership of 30 has formed 3 committees, M,S,R ,which have 8,12,5 members ,respectively, if no member of committee M is on either of the other 2 committee. what is the greatest possible number of members in the club who are on none of the committees???
A5 B7 C8 D10 E12(答案是D)
Thank you in advance!
以下是引用yuyanhan在2005-5-12 18:25:00的发言: 谢谢,请教第三十七题如何做
这题我也正不会呢。期待NN的解答
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