Two fair coins are tossed. What is the probability of getting exactly one head?
Answer and explanation
Correct answer: A.
- Step 1: The equally likely outcomes are HH, HT, TH and TT. Step 2. Exactly one head happens in HT and TH: . **Answer: . Why not the others:** counts only HT, is the probability of at least one head, and treats 0, 1 and 2 heads as equally likely.
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