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A coin is tossed thrice. What is the probability of getting two consecutive tails?

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A coin is tossed thrice. What is the probability of getting two consecutive tails?

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Outcomes {O}: {(HHH), (THH), (HTH), (HHT), (HTT), (THT), (TTH), (TTT)}

Two consecutive tails {F} : {(HTT), (TTH), (TTT)}

n{F} = 3

n{O} = 8

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