更新1:
the figure on the right is called the pascal triangle.how this is related to binomial theorem? 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1
更新2:
http://a.imageshack.us/img831/2283/93796791.png
更新3:
有冇式Q.1
