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Eight points are equally spaced on a circle. If 4 of the 8 points are to be chosen at random, what is the probability that a quadrilateral having the 4 points chosen as vertices will be a square?
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A$$\frac{1}{70}$$
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B$$\frac{1}{35}$$
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C$$\frac{1}{7}$$
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D$$\frac{1}{4}$$
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E$$\frac{1}{2}$$
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