The total letters in box III = 3 + 1 + 2 + 5 + 3 + 4 = 18 Out of which: White letters = 3 + 5 = 8 Blue letters = 1 + 3 = 4 Yellow letters = 2 + 4 = 6 Ways of selecting 2 letters out of 18 without replacement =18C2 Ways of selecting 2 letters out of 10 not white letters without replacement =10C2 Possibility of the letters picked are not white =