Learn when to "Add" and "Multiply" in Permutation & Combination questions- Exercise Question #2
A traffic signal has 4 colors: Red, Blue, Green, and Yellow. Signals are made by combining any 2 of these 4 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
Learn to use the Keyword Approach in Solving PnC question from the following article:
Learn when to "Add" and "Multiply" in Permutation & Combination questions
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Learn when to “Add� and “Multiply� in P & C
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