sat2 maths
问题描述：
sat2 maths
During March Madness,64 college basketball teams try to battle their way into the Final Four,or the semifinals of the national tournament.From the original 64 teams,how many different Final Four groupings can there be?
the answer is 635376
答
嘿嘿,这题偶做过···简化一下题目,也就是从64个量里面取出4个量.同时,因为这四个量是没有顺序要求的,所以直接套用公式,就是C的那个公式,列出式子是64!÷（4!*60!）=635376
鉴于你可能不是很明白公式（就是C、P那两个）,又给你搜了下,链接在这