Question

One red marble, two white marbles, and three blue marbles are in a bag. Two marbles are drawn from the bag WITHOUT replacement. What is the probability that both marbles are blue?

Answer 1

1 in 5 (25% chance)

Explanation:

The probability of choosing a blue marble the first time is 1 in 2, and then choosing it again would be 2 in 5, and 1:2 times 2:5 = 2:10. there is a 20% chance, or 1 in 5 chance, that a blue marble is drawn.