Q25:

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

答案是C

Q29:

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

答案是C

25.（3*2*1）/(3^3)

29.48*9+2+6