math
posted by raja harishchandra .
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 
raja harishchandra
please answer

math 
raja harishchandra
its urgent

math 
Anonymous
10

math 
Steve
10 looks good to me.
Of the 8 possible outcomes, 7 have at least one head
3 of those have exactly 2 heads. 
math 
pappu raja
arre arnav padhai karne lag ja.............tughe ye bhi nahi aaya

math 
pappu raja
chal le tere liye answer...gift..........................2
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