A box contains 5 red balls, 3 blue balls, and 2 green balls. If one ball is drawn at random, what is the probability that it is not blue?
Correct: B
There are a total of 5 + 3 + 2 = 10 balls. The number of balls that are not blue is 5 (red) + 2 (green) = 7. Therefore, the probability of drawing a ball that is not blue is 7/10.