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JAMB 1985 · UME · Q30

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

Worked solution (try it first)
  1. Two coins give 4 equally likely outcomes: HH, HT, TH, TT.
  2. "At least one head" is every outcome except TT, so it is the complement of no heads: 1−141 - \frac14.
  3. So the probability is 34\frac34, option E.

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