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Scrooge McDuck is fond of diving into and swimming in his money, a mixed pool of 35% of gold-silver alloy coins and 65% gold coins,
Scrooge McDuck is fond of diving into and swimming in his money, a mixed pool of 35% of gold-silver alloy coins and 65% gold coins, where these two coins are not distinguishable unless carefully analyzed. On his way out, he randomly holds six coins for his grandnephews. Let X be the number of gold coins that he gives to his grandnephews. Find Variance of X.
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