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Question
Three fair coins are tossed together. Find the probability of getting atmost two tails
Solution
Three fair coins are tossed together
Sample spade = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}
n(S) = 8
Let D be the event of getting atmost two tails.
D = {HTT, TTT, TTH, THT, THH, HHT, HTH}
n(D) = 7
P(D) = `("n"("D"))/("n"("S")) = 7/8`
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