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WAEC Mathematics 2023 Question 32

Question 32

Probability

A bag contains 4 white marbles and 3 blue marbles. Another bag contains 5 red and 6 blue marbles. If a marble is picked at random from each bag, find the probability that they are of the same colour.

  1. A.1/2
  2. B.18/77
  3. C.11/12
  4. D.9/11
Show the answer and explanation

Answer: B (18/77)

Explanation

Only blue is in both bags, so P(both blue) = 3/7 × 6/11 = 18/77.