Each street in a particular town intersects every existing street exactly one time. Only two streets...

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Each street in a particular town intersects every existing street exactly one time. Only two streets pass through each intersection.

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a. A traffic light is needed at each intersection. How many traffic lights are needed if there are 5 streets in the town? 6 streets? 

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b. Describe a pattern you can use to find the number of additional traffic lights that are needed each time a street is added to the town.

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Transcribed Image Text:

2 streets 3 streets 4 streets