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JAMB Mathematics 1999 Question 45

Question 45

Probability

A number is selected at random from 0 to 20. What is the probability that the numbers is an odd prime?

  1. A.8/21
  2. B.1/3
  3. C.2/7
  4. D.5/21
Show the answer and explanation

Answer: B (1/3)

Explanation

0 to 20 is 21 numbers. The odd primes are 3, 5, 7, 11, 13, 17 and 19, which is 7 numbers. 7/21 = 1/3.