Asked 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?
Answered by raja harishchandra
please answer
Answered by raja harishchandra
its urgent
Answered by Anonymous
10
Answered by Steve
10 looks good to me.
Of the 8 possible outcomes, 7 have at least one head
3 of those have exactly 2 heads.
Answered by pappu raja
arre arnav padhai karne lag ja.............tughe ye bhi nahi aaya
Answered by pappu raja
chal le tere liye answer...gift..........................2
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