$ S_20 = rac202 (2 imes 5 + 19 imes 3) = 10 (10 + 57) = 10 imes 67 = 670 $. - AMAZONAWS

📅 March 11, 2026 👤 scraface

Mar 11, 2026

$$ S_{20} = rac{20}{2} (2 imes 5 + 19 imes 3) = 10 (10 + 57) = 10 imes 67 = 670 $.$