Answer
$\frac{1}{2}$
Work Step by Step
There are 13 cards of each suit in the deck. 2 of the suits are black, so there are 26 black cards and the probability of a heart is 26 of 52.
$\frac{26}{52}=\frac{26\div26}{52\div26}=\frac{1}{2}$
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