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WAEC Mathematics 1993 Question 45

Question 45

Probability

What is the probability that an integer selected from the set of integers (20, 21, ........ 30) is a prime number?

  1. A.2/11
  2. B.5/11
  3. C.6/11
  4. D.9/11
  5. E.2/3
Show the answer and explanation

Answer: A (2/11)

Explanation

There are 11 integers from 20 to 30, and only 23 and 29 are prime: probability 2/11.