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WAEC Further Mathematics 2020 Question 17

Question 17

Probability

Calculate the probability that the product of two numbers selected at random with replacement from the set {−5, −2, 4, 8} is positive.

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

Answer: B (1/2)

Explanation

The product is positive when both numbers have the same sign: 2 × 2 + 2 × 2 = 8 of the 16 pairs. P = 1/2.