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

Option :

Answer:Option 1

Explanation:

Solution:
Getting at most Two heads means 0 to 2 but not more than 2.
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)=78



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