SOLUTION: There are 22 students in Mario's class. Mario's teacher is planning to pair the students up for a project. How many different combinations of pairs are possible?

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Question 556232: There are 22 students in Mario's class. Mario's teacher is planning to pair the students up for a project.
How many different combinations of pairs are possible?

Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
22c2 = 22! / (20!*2!) = 231
they can be paired in 231 combinations.