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Consider a standard deck of 52 cards with 4 aces. 5 cards are drawn from the deck, and let X be the number of aces in the 5 cards

/in /by

Consider a standard deck of 52 cards with 4 aces. 5 cards are drawn

from the deck, and let X be the number of aces in the 5 cards.
Find Var(X).
The answer is 5(1/13)(12/13)[(52-5)/(52-1)]. I don’t know how to get this answer.

 
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