Concept explainers
Exercises 37-44 can be solved using combinations even though the problem statements will not always include the word "combination" or "subset."
Number of Paths from Point to Point In a certain city, there are seven streets going north-south and four streets going east-west. How many street paths start at the southwest corner of the city, end at the northeast corner of the city, and have the shortest possible length? (Mathematics Teacher calendar problem)

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