GWD 3-11

summersmiles

我在概念上有些不太明白这些题,可否有牛牛给解答一下.感激万分!!

Q11:

If s is the product of the integers from 100 to 200, inclusive, and t is the product of the integers from 100 to 201, inclusive, what is 1/s + 1/t in terms of t?

A.     (201)²/t

B.     [(202)(201)]/t

C.     201/t

D.     202/t

E.      [(202)(201)]/t²

cherrywds

s=100*101*...*199*200

t=100*101*...*199*200*201

s=t/201, 1/s=201/t

1/s+1/t=201/t+1/t=202/t

D is the correct answer.

SunnyApples

ding !!!!!!!!!!!!