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Three unbiased coins are tossed. What is the probability of getting at most two heads ?

Three unbiased coins are tossed. What is the probability of getting at most two heads ? Correct Answer 3\/4

Let S be the sample space.Here n(S)= 23 = 8Let E be the event of getting atmost two heads. Then,n(E) = {(H,T,T), (T,H,T), (T,T,H), (H,H,T), (T,H,H), (H,T,H)}Required probability = n(E)/n(S) = 6/8 = 3/4.

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