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A traffic signal has 4 colors: Red, Blue, Green, and Yellow. Signals are made by combining any 22 of these 44 colors. How many unique signals can the traffic signal show if the order of the colors defines unique cases?
A) 3
B) 6
C) 8
D) 12
E) 24
Answer: D
Source: e-GMAT
A) 3
B) 6
C) 8
D) 12
E) 24
Answer: D
Source: e-GMAT
