Question

In a bag, there are 10 black plastic chips, 7 yellow, 5 red, and 3 green. Two chips are drawn at random with replacement.

Answer 1

When the black chip is drawn, there is already one less chip in the bag; keep this in mind..

the probability of getting a black chip out of the bag is 10/25 or 2/5

now since there is one less chip, there is a total of 24 chips now..

so now the probability of getting a red chip is 5/24 

then you would multiply the two events together and get:

2/5 x 5/24....solve