證明題。。。請幫幫忙

證明 （nC0)+ (nC1)+(nC2).....(nCn-1)+(nCn) = 2^n

所有跟帖： 

• 有很多辦法 -haha2000- ♂ (568 bytes) () 01/28/2009 postreply 06:08:50

• or you can simply count it, if your teacher does not -idiot94- ♂ (43 bytes) () 01/29/2009 postreply 06:20:54

• 回複：證明題。。。請幫幫忙 -chang2009- ♂ (49 bytes) () 01/31/2009 postreply 04:10:53