Binomial expansion ((a+b)^n = Σ nCr a^{n−r} b^r for non-negative integer n.)

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(a+b)^n = Σ nCr a^{n−r} b^r for non-negative integer n.

What each symbol means

SymbolWhat it stands for
nNon-negative integer
a,bCommuting symbols

When to use this

Standard binomial theorem; n ∈ ℕ.