A coin is tossed twice what is the probability that at least one tail occurs?

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Solution

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When a coin is tossed twice the sample space is given by $S={HH,HT,TH,TT}$ Let $A$ be the event of the occurrence of at least one tail $⇒A={HT,TH,TT}$ $∴P(A)=n(S)n(A) =43 $