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JAMB Mathematics 1989 Question 50

Question 50

Probability

Two numbers are chosen at random from three numbers 1, 3, 6. Find the probability that the sum of the two is not odd.

  1. A.2/3
  2. B.1/2
  3. C.1/3
  4. D.1/6
Show the answer and explanation

Answer: C (1/3)

Explanation

The possible pairs are 1 + 3 = 4, 1 + 6 = 7 and 3 + 6 = 9. Only one of the three sums is even, so the probability is 1/3.