What is the probability that a fair coin will show “heads” 2 out of 4 times?

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Correct Answer: **B.** *3/8*

There are 2^{4}=16 different outcomes than can be observed from flipping a coin 4 times (e.g. HHHH, HHHT, HHTH, etc.), out of which only 6 arrangements contain exactly two heads. Therefore, the probability is 6 out of 16, i.e. 3/8.

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