\sum_k=1^9 k^3 = \left( \frac9 \cdot 102 \right)^2 = (45)^2 = 2025. - AMAZONAWS

📅 March 11, 2026 👤 scraface

Mar 11, 2026

$\sum_{k=1}^{9} k^3 = \left( \frac{9 \cdot 10}{2} \right)^2 = (45)^2 = 2025.$