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WAEC Mathematics 2021 Question 46

Question 46

Probability

A box contains 40 identical balls of which 10 are red and 12 are blue. If a ball is selected at random from the box, what is the probability that it is neither red nor blue?

  1. A.9/20
  2. B.3/10
  3. C.1/4
  4. D.11/20
Show the answer and explanation

Answer: A (9/20)

Explanation

40 − 10 − 12 = 18 balls are neither colour, so the probability is 18/40 = 9/20.