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Home » La somme des \( n \) premiers termes d’une suite arithmétique est donnée par \( S_n = \fracn2(2a + (n-1)d) \). Si \( a = 3 \), \( d = 2 \), et \( S_n = 105 \), trouver \( n \). - AMAZONAWS

La somme des \( n \) premiers termes d’une suite arithmétique est donnée par \( S_n = \fracn2(2a + (n-1)d) \). Si \( a = 3 \), \( d = 2 \), et \( S_n = 105 \), trouver \( n \). - AMAZONAWS

📅 March 11, 2026 👤 scraface
Mar 11, 2026
La somme des \( n \) premiers termes d’une suite arithmétique est donnée par \( S_n = \frac{n}{2}(2a + (n-1)d) \). Si \( a = 3 \), \( d = 2 \), et \( S_n = 105 \), trouver \( n \).

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