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WAEC Mathematics 2000 Question 21

Question 21

Probability

The probabilities that Kodjo and Adoga pass an examination are 3/4 and 3/5 respectively. Find the probability of both boys failing the examination.

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

Answer: A (1/10)

Explanation

P(both fail) = (1 − 3/4)(1 − 3/5) = 1/4 × 2/5 = 1/10.