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8 December, 07:59

A fair coin is tossed twice in succession. The set of equally likely outcomes is {HH, HT, TH, TT}. What is the probability of getting exactly two tails?

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  1. 8 December, 08:25
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    The probability is 1/4

    This is because:

    Probability of first tails = 1/2

    Probability of second tails = 1/2

    Probability of first AND second tails = 1/2 * 1/2

    = 1/4

    This is also visible in the set of outcomes
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