Question

A bag contains 6 red, 5 blue and 4 yellow marbles. Two marbles are drawn, but the first marble drawn is not replaced. Find P(red, then blue).

Answer 1

5 + 6 + 4 = 15

red is 6/15 then taken out

then blue is 5/14

6/15 * 5/14 = 1/7

1/7 or about 0.143