WAEC Mathematics 2014 Objective — Question 43
Question 43 of 50 from the West African Examinations Council (WAEC) Mathematics 2014 Objective paper, with the correct answer and a full explanation.
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If a number is selected at random from each of the sets P={1,2,3} and Q={2,3,4,5}, find the probability that the sum of the numbers is prime.
- A. 5/9
- B. 4/9Correct
- C. 1/3
- D. 2/9
Explanation
Total possible sums form a grid of outcomes; counting the prime sums out of the total equally likely outcomes gives a probability of 4/9.
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