[Q. ] GWD7-18&33
18. If an integer n is to be chosen at random from the integers 1 to 96,
inclusive, what is the probability that n(n + 1)(n + 2) will be divisible by 8?
A. 1/4
B. 3/8
C. 1/2
D. 5/8
E. 3/4
答案d
這題我本來是想說是不是n只要是2的倍數就可以了？？
DS
33.The annual rent collected by a corporation from a certain building was x
percent more in 1998 than in 1997 and y percent less in 1999 than in 1998.
Was the annual rent collected by the corporation from the building more in
1999 than in 1997?
(1) x > y
(2) xy/100 < x – y
答案b
這題我式子列到最後 1999 annual rent扣掉1997
令a為1997當年的rent
a(1+x/100)(1-y/100)-a>0 ------> x-y-xy>0 但b選項無法證明x-y-xy是大於還小於
零呀
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