P1-PS-Q7

[拎]

For every positive 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?

(1) between 2 and 10

(2) between 10 and 20

(3) between 20 and 30

(4) between 30 and 40

(5) greater than 40

Answer: (5)

有人可以幫我解釋為什麼嗎??

[sunnyblue13s]

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http://www.formosamba.com/phpBB3/viewtopi ... 100%29%2B1