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October 2, 2014

Homework Help: Geometry

Posted by Abhishek Ranjan on Monday, June 10, 2013 at 1:35am.

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 ab, where a and b are coprime positive integers. What is the value of a+b?

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