Three coins are tossed. If one of them shows tail, then find the probability that all three coins show tail.
Three coins are tossed. If one of them shows tail, then find the probability that all three coins show tail.
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Correct Answer - `1//7`
Let E be the event which all three coins show tail and F be the event in which a coin shown tail. Therefor, `F={HHT}.` Hence, the required probability is
`thereforeP(E//F)=(P(EnnF))/(P(E))=(1)/(7)`
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