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Add some sparse notes on combinations

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hparra committed Dec 12, 2016
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Combinations
============
## Introduction
The number of k-combinations of an n-set can be expressed in terms of the number of k-permutations in that set.
- For every k-combination
- there are exactly k! permutations of its elements
k-combination of an n-set
`(number of permutations of n) / (number of permutations of k)`
Why?
## REFERENCES
Combinations. Sal Khan. Khan Academy.

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