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JAMB Mathematics 2011 Question 49

Question 49

Probability

Find the probability that a number picked at random from the set {43, 44, 45, ..., 60} is a prime number.

  1. A.2/3
  2. B.1/3
  3. C.2/9
  4. D.7/9
Show the answer and explanation

Answer: C (2/9)

Explanation

The set has 18 numbers, and the primes are 43, 47, 53 and 59. So P = 4/18 = 2/9.