Question
Three unbiased coins are tossed . What is the probability of getting at most two heads ?
Answer: Option D
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Here S = ( TTT, TTH, THT, HTT, THH, HTH, HHT, HHH)
Let E = Event of getting at most two heads .
Then , E = (TTT, TTH, THT, HTT, THH, HTH, HHT)
`:.` ` P(E) = (n(E))/(n(S)) = 7/8`
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