Posted by **raja harishchandra** on Thursday, June 13, 2013 at 1:54am.

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?

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**raja harishchandra**, Thursday, June 13, 2013 at 1:54am
please answer

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**raja harishchandra**, Thursday, June 13, 2013 at 2:00am
its urgent

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**Anonymous**, Thursday, June 13, 2013 at 2:25am
10

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**Steve**, Thursday, June 13, 2013 at 4:56am
10 looks good to me.

Of the 8 possible outcomes, 7 have at least one head

3 of those have exactly 2 heads.

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**pappu raja**, Friday, June 21, 2013 at 6:17am
arre arnav padhai karne lag ja.............tughe ye bhi nahi aaya

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**pappu raja**, Friday, June 21, 2013 at 6:18am
chal le tere liye answer...gift..........................2

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