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

Options:
A .   3 4
B .   1 4
C .   3 8
D .   7 8
Answer: Option D

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}.



Three Unbiased Coins Are Tossed. What Is The Probability Of ... P(E) =
n(E)
=
7
.
n(S)
8


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