+**7c2**
+"7c2" is a mathematical notation representing the number of ways to choose 2 distinct items from a set of 7 unique items, without regard to their order. This fundamental concept in [Combinatorics](/wiki/Combinatorics) is a specific instance of a [Combination](/wiki/Combination) and calculates to 21 possible selections.
+## See also
+- [Permutation](/wiki/Permutation)
+- [Factorial](/wiki/Factorial)
... 1 more lines