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WAEC Mathematics 2004 Question 49

Question 49

Probability

A bag contains 3 red and 2 white identical balls. If 2 balls are picked at random from the bag, one after the other and with replacement, find the probability that they are of different colours

  1. A.36/625
  2. B.16/625
  3. C.12/25
  4. D.13/25
Show the answer and explanation

Answer: C (12/25)

Explanation

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