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A traffic light is needed at each intersection. How many traffic lights are needed if there are 6 streets in the town.
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A traffic light is needed at each intersection. How many traffic lights are needed if there are 6 streets in the town.

User Maccath
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Depending on how the streets are arranged in a grid parallels and perpendicuraly equal you would have 9 intersections
User David Torrey
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