Two urns each contain green balls and blue balls. Urn I contains 4 green balls and 6 blue balls, and Urn II contains 6 green balls and 2 blue balls. A ball is drawn at random from each urn. What is the probability that both balls are blue?

Question

A. 2/15
B. 3/20
C. 1/10
D. 4/153

Answer 1

Urn 1: 6 blue of 10 total
Urn 2: 2 blue of 8 total

So, P(blue,blue) = 6/10 * 2/8

Answer 2

12/80