SOLUTION: In a class there are 45 ways to make pairs of students. How many students are there in the class?

Question 1116438: In a class there are 45 ways to make pairs of
students. How many students are there in the class?
Answer by ikleyn(52776) (Show Source): You can put this solution on YOUR website!
.

If "n" is the number of students in the class, then the number of possible pairs is .


Your equation is


 = 45,   or   n*(n-1) = 90,  which implies  n = 10.


Answer.  There are 10 students in the class.

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