Question: I need to review probability

Hi,

I'm preparing for GRE and i came across this question from 800score.com while reviewing concepts for probability.

In a deck of 52 standard playing cards, what is the probability that pulling a single card from the deck 
will produce a black card?

http://www.800score.com/content/gre/guidec7dview1a.html

Please review this problem and help me with it. 
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