Question

There are 5 red marbles and 3 blue marbles in a jar. What is the probability you selected a blue marble, do not replace it, and then select another blue marble?

Answer 1

3/28

Explanation:

5 + 3 = marbles in total.

P(first blue) = 3/8

P(second blue) = (3-1) / (8-1) = 2/7

P(selecting 2 blue) = (3/8) X (2/7) = 6/56 = 3/28