请教 GMATPrep 一题

For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100)+1, then p is

a) between 2 and 10

b) between 10 and 20

c) between 20 and 30

d) between 30 and 40

e) greater than 40

答案是E，可是我不知道怎么做这种题目,

一直以为数学不是很难，可是刚刚过GMATPrep的时候，发现有好多的题目都没有见过，跟我原来做的完全不一样。。是不是GMAT数学增加了难度呢！！

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=150752&page=1

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还有哪个大侠能告诉我，我应该怎么准备数学呢？现在满头都是雾水。。

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=143895&page=1

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