[計量] PP1-Q7
7.
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
這題解法由(2*4*6*8...*100)+1=2^50*50!+1 解起
我想問的是為什麼(2*4*6*8...*100)+1 會等於 2^50*50!+1 ?
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