Multiple choice

An urn contains 2 red, 3 green and 2 blue balls. If a ball is drawn at random, then find the probability that the ball is not blue.

  1. 5/7

  2. 10/21

  3. 2/7

  4. 11/21
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A Correct answer
Explanation

Total balls = 2 + 3 + 2 = 7. Balls that are not blue = 2 red + 3 green = 5. Probability = 5/7.

AI explanation

Using the classical definition of probability, the probability of an event equals the favorable outcomes divided by the total outcomes. The total number of balls is 2 plus 3 plus 2, which equals 7. The number of balls that are not blue is the sum of red and green balls, which is 2 plus 3, equaling 5. The probability is therefore 5 divided by 7, which is the result.

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