? :P
P(3) × C(10, 3); C(18, 3)
所有跟帖:
• thanks -donz94086- ♂ (0 bytes) () 02/19/2007 postreply 20:00:18
• haha, misread one info. The revised answer --> -ppzcgg- ♀ (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- ♀ (82 bytes) () 02/21/2007 postreply 11:45:40