The sum of the first \( n \) terms of an arithmetic sequence is given by \( S_n = \frac{n}{2} (2a + (n-1)d) \). If the first term \( a = 5 \) and the common difference \( d = 3 \), find the sum of the first 15 terms.

Mon, 04 May 2026 17:37:45 +0000

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