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An unfair coin has the property that when flipped four times, the probability
of it landing twice heads up and twice tails up (in any order) is the same as the
probability of it landing three times heads up and once tails up (in any order).
What is the probability of this coin landing heads up in one flip? Express your
answer as a common fraction.

 May 16, 2020
 #1
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As follows:

 

 May 16, 2020

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