MATH STINGER #61 
by Dr. Joel C. Fowler 
Assistant Professor of Mathematics 

For a new puzzle suppose that the 
bus routes of a certain city transit system satisfy 
the following. Every pair of routes have exactly one stop in 
common, every pair of stops lie together on exactly one route, and 
every route has at least three stops. Suppose you are standing at a stop that 
is on 17 different routes. Determine how many stops and how many bus lines there are throughout the city.

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