If a bag contains 4 red marbles and 6 blue marbles, what is the probability of drawing a red marble?

• A. 3/5
• B. 1/5
• C. 2/5
• D. 5/5

Answer: (C)

Probability is the number of favorable outcomes divided by the total number of outcomes. Here, there are 4 red marbles out of 10 total marbles, so the chance of drawing a red marble is 4/10, which simplifies to 2/5 (about 0.4). So the probability is 2/5. The other fractions don’t fit because they would require a different count of red marbles in the bag (for example, 3/5 would need 6 red marbles; 1/5 would need 2 red marbles; 5/5 would mean every draw is red).