Multiple choice

Two fair coins are tossed. What is the probability that at least one coin lands a tail?

  1. $\dfrac{1}{5}$
  2. $\dfrac{3}{4}$
  3. $\dfrac{5}{6}$
  4. $\dfrac{2}{3}$
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B Correct answer
Explanation

The sample space for two coin tosses is {HH, HT, TH, TT}. The outcomes with at least one tail are {HT, TH, TT}. There are 3 such outcomes out of 4 total, so the probability is 3/4.

AI explanation

When two fair coins are tossed, the sample space consists of 4 outcomes: HH, HT, TH, and TT. The outcomes containing at least one tail are HT, TH, and TT. The probability is 3 favorable outcomes out of 4 total outcomes, which equals 3/4.

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