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WAEC Further Mathematics 2021 Question 32

Question 32

Probability

A bag contains 8 red, 4 blue and 2 green identical balls. Two balls are drawn randomly from the bag without replacement. Find the probability that the balls drawn are red and blue.

  1. A.12/91
  2. B.16/91
  3. C.30/91
  4. D.32/91
Show the answer and explanation

Answer: D (32/91)

Explanation

Red then blue or blue then red: (8/14)(4/13) + (4/14)(8/13) = 32/182 + 32/182 = 32/91.