A bag contains 6 red marbles, 6 white marbles, and 4 blue marbles find P (red or blue).

We are given with a number of marbles in different colors. The sample space includes all the marbles inside the bag, hence tehere are 16 marbles. The probability of getting a red or blue marble is the sum of probability of getting a red marble alone and that of a blue marble alone. Hence the answer is (6+4) / 16 equal to 5/8