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JAMB Mathematics 2005 Question 50

Question 50

Probability

What is the probability that an integer x, (1 ≤ x ≤ 20) chosen at random is divisible by both 2 and 3?

  1. A.1/20
  2. B.1/3
  3. C.3/20
  4. D.7/10
Show the answer and explanation

Answer: C (3/20)

Explanation

Numbers divisible by both 2 and 3 are multiples of 6: 6, 12 and 18. So the probability is 3/20.