求助一道prep模考题，求数学达人相救

davidyoung93

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

答案为E ， 求大牛指教

davidyoung93

zjc3420550 发表于 2015-8-4 17:50
h（100）=2*4*6*8........*100 把2都提出来就=2^50*50!，可以看出，所有50以内的数，h（100）+1都会余1，所 ...

谢谢~很受启发！