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math

posted by on .

flip a coin 3 times
a) what are the odds in favor of getting exactly 2 heads
b) what are the odds against getting at most 1 tail

i got a) 3/4 b) 7/8
i don't think they are right can someone help

  • math - ,

    If you flip a coin 3 times, here are the possible combinations:

    HHH
    THH
    HTH
    HHT
    HTT
    THT
    TTH
    TTT

    Only 3 of the 8 possibilities will have exactly 2 heads.

    The odds against getting at most 1 tail are the same as getting no tails. You are right with that answer.

    I hope this helps. Thanks for asking.

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