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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 tails


Total number of outcomes possible when a coin is tossed`=2`

Hence, total number of outcomes possible when `3` coins are tossed,

`:.n(S)=2 xx 2 xx 2=8`

Here `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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