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JAMB Mathematics 1993 Question 48

Question 48

Probability

A number is selected at random between 20 and 30 both numbers inclusive. Find the probability that number is a prime.

  1. A.2/11
  2. B.5/11
  3. C.6/11
  4. D.8/11
Show the answer and explanation

Answer: A (2/11)

Explanation

There are 11 numbers from 20 to 30, and only 23 and 29 are prime, so the probability is 2/11.