So, \( S_4 = 5 \frac2^4 - 12 - 1 = 5 \times (16 - 1) = 5 \times 15 = 75 \). - AMAZONAWS

📅 March 11, 2026 👤 scraface

Mar 11, 2026

$So, \( S_4 = 5 \frac{2^4 - 1}{2 - 1} = 5 \times (16 - 1) = 5 \times 15 = 75 \).$