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WAEC Mathematics 1999 Question 11

Question 11

Probability

From the set A = {3, √2, 2√3, √9, √7}, a number is selected at random. Find the probability that it is a rational number.

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

Answer: B (2/5)

Explanation

Only 3 and √9 = 3 are rational; the other three are irrational. Probability = 2/5.