Every trading day, the price of CF Corp stock either goes up by $1 or goes down by $1 with equal likelihood. At the end of 5 trading days, what is the probability that the price of CF Corp stock is up byexactly $3 from its initial price?
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A$$\frac{1}{16}$$
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B$$\frac{1}{8}$$
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C$$\frac{5}{32}$$
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D$$\frac{9}{32}$$
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E$$\frac{3}{8}$$
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正确答案: C