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

I need to know the formula on this. I have 1/6 over 1- 1/6. But I can't figure out how to do the math. Am I right?

  • math -

    the probability of getting at least one head is = 1-prob(three tails)=1-1/8=7/8

    so the odds are 7:1 to get at least one head.

  • math -

    It' is the other way around if you multiplt your runner.

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