Bac Mathématiques Algeria
Algerian BAC — Mathématiques (Algeria)
Numerical SequencesEnglish
Exam overviewPractice session
An arithmetic sequence (u_n) has first term u_1 = 3 and common difference d = 4. What is the sum of the first 20 terms S_20 = sum_{k=1}^20 u_k?
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