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Mathematics 13 Online
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?

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):

|dw:1368247772234:dw|

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