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Mathematics 7 Online
OpenStudy (anonymous):

A college has thirteen instructors qualified to teach a special computer lab which requires two instructors to be present. How many different pairs of teachers could there be? a. 110 b. 165 c. 60 d. 55 Please show a bit of work so I can understand. :)

OpenStudy (anonymous):

For each of the 13 instructors, how many others are left to pair with them? Then, of all the possible pairs you've found, how can you cut down the duplicates?

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