October 2022 0 121 Report
Bonjour, c'est pour demain

4. On pose Sn = U₁ + U₁ + U₂ + ... + U14, pour tout entier naturel n :
a. Montre que Sn = 2,5n² + 4,5n+ 2
b. Calcule la(les) valeur(s) de n telle(s) que Sn = 1199.

merci d'avance​
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