[Q. ] pp上的一道題
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
小弟不才怎麼算都得不到答案E， 有請高手解惑
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