13!/(2!2!2!2!)-4*12!/(2!2!2!)+16*10!/(2!2!)-24*8!/2+24*6!
回複:一道中學的排列組合題
所有跟帖:
• 13!/(2!2!2!2!)-4*12!/(2!2!2!)+12*11!/(2!2!)-24*10!/2+24*9! -惡狼- ♂ (163 bytes) () 10/08/2009 postreply 13:37:42
13!/(2!2!2!2!)-4*12!/(2!2!2!)+16*10!/(2!2!)-24*8!/2+24*6!
• 13!/(2!2!2!2!)-4*12!/(2!2!2!)+12*11!/(2!2!)-24*10!/2+24*9! -惡狼- ♂ (163 bytes) () 10/08/2009 postreply 13:37:42
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