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JAMB Mathematics 1992 Question 48

Question 48

Probability

The probability of an event P is 3/4 while that of another event Q is 1/6. If the probability of both P and Q is 1/12, what is the probability of either P or Q?

  1. A.1/96
  2. B.1/8
  3. C.5/6
  4. D.11/12
Show the answer and explanation

Answer: C (5/6)

Explanation

P(P or Q) = P(P) + P(Q) − P(both) = 9/12 + 2/12 − 1/12 = 10/12 = 5/6.