My favorite proof of the n choose k formula!

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Euler's Formula: A Complete Guide

Combinatorial Proofs

Sum to n Terms of a GP Formula for the Sum of First n Terms of a GP

My favorite proof of the n choose k formula!

Binomial Coefficient (also know as N Choose K w/ 9+ Examples!)

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Combinatorial Proofs

Prove Pascal's identity, using the formula for $$ (^n_r).