A box contains 3 red, 4 blue, and 5 green balls. What is the probability of drawing 1 red and 1 blue ball when 2 balls are drawn?
Q1. A box contains 3 red, 4 blue, and 5 green balls. What is the probability of drawing 1 red and 1 blue ball when 2 balls are drawn?
Answer: 12 / 66
Explanation: Total balls = 3 + 4 + 5 = 12. Ways to pick 2 balls = 12C2 = 66. Ways to pick 1 red and 1 blue = 3C1 * 4C1 = 3 * 4 = 12. Probability = 12 / 66.