A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. If two marbles are drawn at random without replacement, what is the probability that both marbles are red?

✓ Correct Answer: Option B

Total marbles = 5+3+2 = 10. Probability of drawing the first red marble is 5/10 = 1/2. After one red marble is drawn, there are 4 red marbles left and 9 total marbles. Probability of drawing a second red marble is 4/9. The probability of both events is (1/2) * (4/9) = 4/18 = 2/9.