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Probability - General Aptitude

Q1:

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

A
3
4

B
1
4

C
3
8

D
7
8

ANS:D -

7
8

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) = 7 .
n(S) 8