输血JJ-355 求解答~~~~

xuganwilliam

355.【确定】 prep原题，For every positive even integer n, the
functionh(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）

pattytraine

h(100)+1 和 h(100)互质，h(100)=(2^50)*(50*49*48....*3*2*1)
所以p大于50。