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WAEC Further Mathematics 2025 Question 38

Question 38

Probability

If a fair die is thrown twice, find the probability that the sum is not a prime number.

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

Answer: D (7/12)

Explanation

Prime sums: 2 (1 way), 3 (2), 5 (4), 7 (6), 11 (2): 15 of the 36 outcomes. P(not prime) = 21/36 = 7/12.