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JAMB Mathematics 2014 Question 50

Question 50

Probability

A number is chosen at random from 10 to 30 both inclusive, what is the probability that the number is divisible by 3?

  1. A.3/5
  2. B.2/15
  3. C.1/10
  4. D.1/3
Show the answer and explanation

Answer: D (1/3)

Explanation

There are 21 numbers from 10 to 30. The multiples of 3 are 12, 15, 18, 21, 24, 27, 30: 7 of them. Probability = 7/21 = 1/3.