A bag contains 4 red marbles, 3 blue marbles, and 3 green marbles. If one marble is chosen at random, what is the probability that it is not blue?

✓ Correct Answer: Option B

Total marbles are 4 + 3 + 3 = 10. The number of marbles that are not blue is 4 (red) + 3 (green) = 7. The probability of not choosing a blue marble is 7/10.