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WAEC Mathematics 2020 Question 40

Question 40

Probability

A box contains 12 identical balls of which 5 are red, 4 blue and the rest are green. If two balls are selected at random one after the other with replacement, what is the probability that both are red?

  1. A.25/144
  2. B.5/33
  3. C.5/6
  4. D.103/132
Show the answer and explanation

Answer: A (25/144)

Explanation

With replacement the chance stays 5/12 each time: (5/12) × (5/12) = 25/144.