[求助]GWD31套数学答案讨论：第一套

各位战友，小弟在网上找了许久也没有看到GWD31套数学的讨论，很多都是讨论VERBAL的，但数学里很多题目知道答案却还是不知道怎么做，（过程！！）想在此向给位高手求救！！

Q2:

A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster.  If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?

A.      0

B.      1/9

C.      2/9

D.      1/3

E.       1

Answer:

I.                 -3

II.               1

III.             5

A.    I only

B.    II only

C.    I and II only

D.   II and III only

E.    I, II, and III

Answer:

------------------------------------------------------------------------------------------------------------

Q14:

If 10⁵⁰ – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?

A.     424

B.     433

C.     440

D.    449

E.     467

Answer:

------------------------------------------------------------------------------------------------------------

Q26:

Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y.  At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?

A.     4

B.     6

C.     8

D.    10

E.     12

Answer:

------------------------------------------------------------------------------------------------------------

Q31:

A positive integer n is said to be “prime-saturated” if the product of all the different positive prime factors of n is less than the square root of n.  What is the greatest two-digit prime-saturated integer?

A.     99

B.     98

C.     97

D.    96

E.     95

Answer:

------------------------------------------------------------------------------------------------------------

C D C E D