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OpenStudy (anonymous):
Solve by simplifying the problem. There are 18 students in Mr. Alvarez’s art class. Throughout the year, every student must pair up with every other student to complete a project. How many projects will be finished?
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OpenStudy (primeralph):
18C2
OpenStudy (anonymous):
once you pair up with a student you cannot pair with him again, so repetitions are not allowed 18!
OpenStudy (anonymous):
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