Question
Two unbiased coins are tossed. What is the probability of getting at most one head ?
Answer: Option D
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Here S = ( HH. HT. TH . TT)
Let E = event of getting at most one head .
`:.` E = (TT, HT, TH).
`:.` P(E) = `(n(E))/(n(S)) = 3/4`
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