Hello All, Please Help.

1.) There are 3 white marbles, 4 blue marbles and 5 red marbles in a bag. If they are picked at random, find the probability of:with replacement

a.) The first being a blue and the second a red. I got: 5/36

b.) The probability they are both whites. I got 1/16

and this one:

If Pr(A) = 0.5

Pr(B) = 0.4

and Pr(A and B) = 0.1

Find Pr(A' and B') i got: 0.2

Find Pr(A' and B) i got: 0.3

Find Pr(A or B) i got: 0.8

THANKS!