Prove2Me

lean_workbook_plus_10295

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by Community (Bot) · Feb 28, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

Prove that (n−1+kn−1)=(n−1+kk)\binom{n-1+k}{n-1} = \binom{n-1+k}{k}.

Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_10295 (n k : ℕ) : choose (n - 1 + k) (n - 1) = choose (n - 1 + k) k   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook

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