Two cards are selected from an ordinary deck of cards. Determine the probability.
Prob [a Black Ace and a Black Jack].
There are 2 black aces and two black jacks.
P (black Ace, black jack) = 2C1 2C1/ 52C2
= 4 *2/(52*51) = 2/(13*51) = 2/663= 0.003017
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