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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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On a skiing trip there are five people but only three pairs of skis how many different groups of three could ski

User Brij
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10 different groups can ski.

This is a combination of 5 items taken 3 at a time:

_5C_3=(5!)/(3!(5-3)!)=(5!)/(3!2!)=(120)/(12)=10
User Tim Bartsch
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