Question
Three unbiased coins are tossed . What is the probability of getting at least 2 heads ?
Answer: Option B
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Here S = ( TTT, TTH, THT, HTT, THH, HTH, HHT, HHH).
Let E = event of getting at least two heads = ( THH, HTH, HHT, HHH)
`:.` ` P (E) = (n(E))/(n(S)) = 4/8 = 1/2`
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