A bag contains 4 red marbles, 6 blue marbles and 2 green marbles. If two marbles are drawn out of the bag, what is the exact probability that both marbles drawn will be blue?

Answer 1

I would guess that it would be without replacement.

Since there are 12 total marbles, there is a 6/12 chance the first one is blue and 5/11 that the second is blue since you have one less of each.

The probability that both are blue is 6/12 times 5/11 =5/22