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WAEC Mathematics 2011 Question 6

Question 6

Probability

If a number is chosen at random from the set {x: 4 ≤ x ≤ 15}, find the probability that it is a multiple of 3 or a multiple of 4.

  1. A.1/12
  2. B.5/12
  3. C.1/2
  4. D.11/12
Show the answer and explanation

Answer: C (1/2)

Explanation

There are 12 numbers (4 to 15). Multiples of 3 or 4: 4, 6, 8, 9, 12, 15, which is 6 numbers. Probability = 6/12 = 1/2.