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WAEC Mathematics 2008 Question 49

Question 49

Probability

Given the sets A = {2, 4, 6, 8} and B = {2, 3, 5, 9}. If a number is picked at random from each of the two sets, what is the probability that their difference is 6 or 7?

  1. A.1/256
  2. B.1/16
  3. C.1/8
  4. D.1/2
Show the answer and explanation

Answer: C (1/8)

Explanation

There are 4 × 4 = 16 pairs. Difference 6: (8, 2); difference 7: (2, 9). So 2/16 = 1/8.