SOLUTION: Ten students are in pairs on a field trip. How many different pairs of students are possible?

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Question 732291: Ten students are in pairs on a field trip. How many different pairs of students are possible?
Found 2 solutions by lynnlo, Alan3354:
Answer by lynnlo(4176) About Me  (Show Source):
Answer by Alan3354(69443) About Me  (Show Source):
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Ten students are in pairs on a field trip. How many different pairs of students are possible?
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The 1st chosen is 1 of 10, then 1 of 9
10*9 = 90