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?

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.

Hence,option 2 is the correct answer.

By: Amit Kumar