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+1 vote
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asked in general by (820 points)  
You can bring along 2 friends! you have 5 friends who want to come along. How many different groups of friends could you take with you?
  

1 Answer

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answered by (820 points)  
Here the order of the r elements does not matter, so we will use combination formula:

= $\frac{n!}{r!\left(n-r\right)!}$

= $\frac{5!}{2!\left(5-2\right)!}$

= 10

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