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

Can someone help me figure out how to solve this, please?

  • Math -

    YOu could get
    Htt
    tHt
    ttH
    HHt
    HtH
    tHH
    HHH

    7 ways to get at least one head, and the probability of getting each one of those is 1/2*1/2*1/2 or 1/8

    Pr= 7/8 getting at least one head.

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