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WAEC Mathematics 2019 Question 34

Question 34

Probability

A box contains 2 white and 3 blue identical balls. If two balls are picked at random from the box, one after the other with replacement, what is the probability that they are of different colours?

  1. A.2/3
  2. B.3/5
  3. C.7/20
  4. D.12/25
Show the answer and explanation

Answer: D (12/25)

Explanation

P(white then blue) + P(blue then white) = (2/5)(3/5) + (3/5)(2/5) = 12/25.