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WAEC Mathematics 2001 Question 32

Question 32

Probability

If the probability that an event will occur is p and the probability that it will not occur is q, which of the following is true?

  1. A.p − q = 1
  2. B.q − p = 0
  3. C.p + q = 1
  4. D.p + q = 0
Show the answer and explanation

Answer: C (p + q = 1)

Explanation

An event either happens or it does not, so the two probabilities add up to 1.