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JAMB Mathematics 2017 Question 40

Question 40

Probability

In a class of 60 students, 30 offer Physics and 40 offer Chemistry. If a student is picked at random from the class, what is the probability that the student offers both Physics and Chemistry?

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

Answer: D (1/6)

Explanation

30 + 40 = 70, which is 10 more than the 60 students, so 10 students offer both. Probability = 10/60 = 1/6.