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JAMB Mathematics 1985 Question 30

Question 30

Probability

If two fair coins are tossed, what is the probability of getting at least one head?

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

Answer: E (3/4)

Explanation

The only outcome with no head is TT, with probability ¼. So P(at least one head) = 1 − ¼ = ¾.