A coin is tossed twice. Given at least one head occurs, the probability of two heads is:
A coin is tossed twice. Given at least one head occurs, the probability of two heads is:
- A. 1/3
- B. 1/2
- C. 1/4
- D. 2/3
Answer: A) 1/3
Explanation: Sample space={HH,HT,TH}. Only HH satisfies two heads. Probability=1/3.
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