In the experiment of flipping a coin four times, what is the probability of obtaining odd number of heads if it is known that the first two tosses are different?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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 In the experiment of flipping a coin four times, what is the probability of
obtaining odd number of heads if it is known that the first two tosses are different? 

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