lean_workbook_plus_10203
OpenProve that using Pascal's formula.
Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_10203 (r : ℕ) : choose (r + 1) 2 + choose (r + 1) 3 = choose (r + 2) 3 := by sorry
Source
Prove that using Pascal's formula.
import Mathlib.Analysis.Complex.Basic
theorem lean_workbook_plus_10203 (r : ℕ) : choose (r + 1) 2 + choose (r + 1) 3 = choose (r + 2) 3 := by sorry