Cool Cars

Team: 
The Algebrainiacs
Topic: Probability, Counting & Combinatorics
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In a certain parking lot, there are 2 black cars, 3 blue cars, 4 red cars and 3 green cars. If there are no other cars in the parking lot, what is the probability that a car randomly chosen from the parking lot is not green? Express your answer as a common fraction.

Common Core Standards: 7.SP.7
Problem #: 
35 (2011-2012)
Problem Difficulty Level: 3 [?]