涛涛 3-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

                                                              ^{answer：D 不会阿....数学倒退了..哪位大侠指点下~谢谢~~~}

s=100*...*200

t=100*...*200*201=s*201

1/s+1/t=1/s+1/(s*201)=201/(s*201)+1/(s*201)=(201+1)/(s*201)=202/(s*201)=202/t

Choose D.