WAEC Further Mathematics 2025 Objective — Question 38

Question 38 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2025 Objective paper, with the correct answer and a full explanation.

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

A. 5/12
B. 1/4
C. 3/4
D. 7/12Correct

Explanation

Prime sums possible are 2,3,5,7,11 with counts 1+2+4+6+2=15 out of 36. P(prime)=15/36=5/12, so P(not prime)=7/12.

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