$ S_n = \frac252 \times (2 + 50) = \frac252 \times 52 = 25 \times 26 = 650 $. - AMAZONAWS

📅 March 11, 2026 👤 scraface

Mar 11, 2026

$$ S_n = \frac{25}{2} \times (2 + 50) = \frac{25}{2} \times 52 = 25 \times 26 = 650 $.$