Question

A bag has five red marbles, six blue marbles, and four black marbles. What is the probability of picking a blue marble, replacing it, and then picking another blue marble?

a)1/15
b)8/75
c)4/25
d)1/9

Answer 1

4/15 is 100% the answer *NOT* 1/9 or anything else!

Explanation:

Answer 2

5 red, 6 blue, 4 black...total of 15

P(picking blue) = 6/15 ...reduces to 2/5
replacing
P(picking blue) = 6/16...reduces to 2/5

P(both) : 2/5 * 2/5 = 4/25 <==