不好意思 要請各位幫忙看看以下兩題 @@
要麻煩各位高手了
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
ANS:E
19.For a finite sequence of nonzero numbers, the number of variations in
sign is defined as the number of pairs of consecutive terms of the sequence
for which the product of the two consecutive terms is negative. What is the
number of variations in sign for the sequence 1, -3, 2, 5, -4, -6 ?
(A) One
(B) Two
(C) Three
(D) Four
(E) Five
ANS:C
想破頭也想不出WHY......>_<
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