What does n choose k mean?

My favorite proof of the n choose k formula!

What is n choose k? || formula, examples, Pascal's triangles

How to choose k for k-Means?

[Combinatorics] - What is N Choose K?

P1: 3 choose 1, n choose k problem

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Sum of n CHOOSE k (Nice identity!)

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Fun Facts on N Choose K Binomials

Combinatorial proof that (n choose k)=(n-1 choose k)+(n-1 choose k-1)

n choose k

Binomial Theorem, prove n choose k = n!/(k!(n-k)!)

Determining the Content of N choose K Subsets

Counting and Probability N-choose-K Notation

Comparing NChooseK Algorithms - 1 of 4

Factorials, PERMUTATIONS & Combinations | solving n-choose-k problems

Combinatorial Results: N choose k

Factorials and Combinatorics : n choose k

n Choose k Equals n Choose n-k