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WAEC Mathematics 2008 Question 47

Question 47

Probability

Given the sets A = {2, 4, 6, 8} and B = {2, 3, 5, 9}. If a number is selected at random from set B, what is the probability that the number is prime?

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

Answer: B (3/4)

Explanation

2, 3 and 5 are prime; 9 is not. Probability = 3/4.