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 Problem: 3 unbiased coins are tossed, What is the probability of getting exactly 2 tails [ Calculator, Method and examples ]Solution:Your problem -> 3 unbiased coins are tossed, What is the probability of getting exactly 2 tailsTotal number of outcomes possible when a coin is tossed=2Hence, total number of outcomes possible when 3 coins are tossed,:.n(S)=2 xx 2 xx 2=8Here S = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}Let E = event of getting exactly 2 tail :. E = {HTT, THT, TTH}:.n(E) = 3:.P(E)=(n(E))/(n(S))=3/8

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