Question

Three fair coins are tossed together. Find the probability of getting at most two tails.

Answer 1

Three fair coins are tossed together

Sample spade = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}

n(S) = 8

Let D be the event of getting atmost two tails.

D = {HTT, TTT, TTH, THT, THH, HHT, HTH}

n(D) = 7

P(D) = `("n"("D"))/("n"("S")) = 7/8`