求一道prep题，灰常感谢！！！

小鱼good · 发表于 2010-3-25 22:23:12

7.905-!-item-!-187;#058&000575

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
大侠们，这题咋做呀？难住了~~~

Miyari · 发表于 2010-3-25 22:40:54

选E。

h(100)+1=2^50*1*2*3*.......50+1

所以在除以1~50各数字时都余1，因此P肯定大于40.

小鱼good · 发表于 2010-3-25 22:52:02

哦

，恍然大悟，非常感谢！

求一道prep题，灰常感谢！！！

所属分类: GMAT考试

正在浏览此版块的会员 ()