Concursul "Teodor Topan" - problema 1

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maky
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Concursul "Teodor Topan" - problema 1

Post by maky »

Fie \( \left(a_n\right)_{n\ge{1}} \) o progresie aritmetica cu ratia nenula.
Stiind ca suma primilor \( n \) termeni ai progresiei este jumatate din suma urmatorilor \( n \) termeni, calculati \( \frac{S_{3n}}{S_n} \).
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