Question
Three coins are tossed once. Find the probability of getting atmost two tails.
Solution
Three coins are tossed.
Sample space, S = {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}
n(S) = 8
Event A: At least one tail occurs
A = {TTT, TTH, THT, HTT, HHT, HTH, THH} n(A) = 7
Hence,