On a skiing trip, there are five people but only three pairs of skis. How many different groups of three could ski?

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On a skiing trip, there are five people but only three pairs of skis. How many different groups of three could ski?

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So let's start by naming our people, let's say Robert, Sasha, Tyler, Bryan, and Katie. Now start listing all the ways that they can go in a organized way.
Robert, Sasha, Tyler
Robert, Sasha, Bryan
Robert, Sasha, Katie
Robert, Tyler, Bryan
Robert, Tyler, Katie
Robert, Bryan, Katie
Sasha, Tyler, Bryan
Sasha, Tyler, Katie
Tyler, Bryan, Katie
And that is it, 9, without repeating the same groups

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