Algebra 2

A coin is tossed three times. Find the probability of each event.
a) at least two tosses come up tails.
b) at least one toss comes up heads.


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  1. a) 2/3
    b) 1/3

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  2. There are only 8 possible outcomes:

    Of those, there are 4 with at least two tails
    a) prob = 4/8 = 1/2

    b) There are 7 with at least one H, (only TTT has no heads)
    so prob = 7/8

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