Multiple choice

There are two containers, with one containing 4 red and 3 green balls and the other containing 3 blue and 4 green balls. One ball is drawn at random from each container. The probability that one of the balls is red and the other is blue will be

  1. 1/7

  2. 9/49

  3. 12/49

  4. 3/7

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The probability of drawing a red ball from the first container is 4/7. The probability of drawing a blue ball from the second container is 3/7. Since these are independent events, the probability of both occurring is (4/7) * (3/7) = 12/49.