A bag contains 12 marbles: 5 are orange, 3 are blue, and the rest are red. If one marble is selected at random from the bag, what is the probability that it will be red or blue?

Answer 1

There are 12 total marbles in the bag. Since 5 are orange, the remaining 7 are blue or red. Thus the probability of picking a red or blue marble is 7/12.