JAMB Mathematics 1990 Question 49

Question 49

Probability

Two numbers are removed at random from the numbers 1, 2, 3 and 4. What is the probability that the sum of the numbers removed is even?

  1. A.⅔
  2. B.½
  3. C.⅓
  4. D.¼
Show the answer and explanation

Answer: C (⅓)

Explanation

There are 6 possible pairs. Only 1 + 3 and 2 + 4 give even sums, so the probability is 2/6 = ⅓.