A bag contains 5 yellow marbles, 7 pink marbles, and 3 purple marbles. Gordon selects a marble without looking. What is the probability that he selects a yellow marble or a purple marble?
5 + 7 + 3 = 15, so there are 15 marbles in the bag There's a 5/15 chance of a yellow marble There's a 3/15 chance of a purple marbe Add them up 8/15 chance of a yellow or purple marble
