## Combination Formula :

$$C(n,r)\;=\;\frac{n!}{r!(n-r)!}$$

**C** is the number of combination.

**N** is the number of items in the set.

**R** is the number of items selected from the set.

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$$C(n,r)\;=\;\frac{n!}{r!(n-r)!}$$

**C** is the number of combination.

**N** is the number of items in the set.

**R** is the number of items selected from the set.