Geometry

Question Analysis
This question involves using the combination formula to find the number of pairs (teams of 2) that can be formed from a larger group.
The main focus is on correctly identifying and and applying the combination formula, while also understanding that we are looking for pairs.

Key Concept Explanation
The combination formula is used because the order in which the friends are paired up does not matter.
Here, is the total number of friends, and is the number of friends in each pair.

Step - by - Step Solution
We have (total number of friends) and (number of friends in each team).

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