Question

A bag contains 2 red marbles, 7 blue marbles and 6 green marbles. If two marbles are drawn out of the bag, what is the probability, to the nearest 1000th, that both marbles drawn will be red?

Answer 1

Let r be the red marble, b the blue marble, g the green marble.
possible outcomes={r,r,b,b,b,b,b,b,b,g,g,g,g,g,g}
total=15
2/15=.133 is the probability