When a certain coin is flipped, the probability of heads is 0.5. If the coin is flipped 6 times, what is the probability that there are exactly 3 heads?
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A$$\frac{1}{4}$$
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B$$\frac{1}{3}$$
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C$$\frac{5}{16}$$
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D$$\frac{31}{64}$$
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E$$\frac{1}{2}$$
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正确答案: C