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March 30, 2017

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What are the odds in favor of getting at least one head
in three successive flips of a coin?

  • math - ,

    1/2 * 1/2 * 1/2

  • math - ,

    ooops, I misread. One head in three tries, so there are three ways
    HTT
    THT
    TTH

    So it is 3*1/2*1/2*1/2

  • math - ,

    The prob of at least one head with 3 coins
    = 1 - 1/8
    = 7/8
    (I excluded the case of all tails)

    so the odds in favour of at least one head
    = (7/8):(1/8)
    = 7:1

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