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There is a jar of 6 silver coins and 13 gold coins. Three coins are to be randomly selected without replacement. Find the probability that

There is a jar of 6 silver coins and 13 gold coins. Three coins are to be randomly selected without replacement.

Find the probability that at least Two gold are removed. Let X be the number of gold coins among the selected three coins. Find E(X). Let X be the number of gold coins among the selected three coins. Find the standard deviation of X.

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