P(3) × C(10, 3); C(18, 3)

? :P

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thanks -donz94086- 给 donz94086 发送悄悄话 (0 bytes) () 02/19/2007 postreply 20:00:18

haha, misread one info. The revised answer --> -ppzcgg- 给 ppzcgg 发送悄悄话 ppzcgg 的博客首页 (520 bytes) () 02/21/2007 postreply 10:50:31

2) C(18, 3) × C(15, 3) × C(12, 3) × C(9, 3) × C(6, 3) × C(3 -ppzcgg- 给 ppzcgg 发送悄悄话 ppzcgg 的博客首页 (82 bytes) () 02/21/2007 postreply 11:45:40

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