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Charles flips a coin four times.  What is the probability that he gets a 3-1 split?  (3 heads and 1 tail, or 1 head and 3 tails)

 Aug 31, 2021
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[4 C 3] / 2^4 ==4 / 16 ==1/4 - probability of 3 heads or 3 tails.

 Sep 1, 2021

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