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math

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A fair coin is flipped 3 times. The probability of getting exactly two heads, given that at least one flip results in a head, can be written as a/b, where a and b are coprime positive integers. What is the value of a+b?

  • math - ,

    please answer

  • math - ,

    its urgent

  • math - ,

    10

  • math - ,

    10 looks good to me.
    Of the 8 possible outcomes, 7 have at least one head
    3 of those have exactly 2 heads.

  • math - ,

    arre arnav padhai karne lag ja.............tughe ye bhi nahi aaya

  • math - ,

    chal le tere liye answer...gift..........................2

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