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A resposta é 2.

",{"_22":65,"_60":66,"_62":67},"d200b53d-5385-4f17-8d22-ddd982f97886","B","

A resposta é 1.

",{"_22":69,"_60":70,"_62":71},"c459eeb9-8a09-4a74-83ea-b0b9976e45e7","C","

A resposta é 3.

",{"_22":73,"_60":74,"_62":75},"0dccbc19-dd34-4177-90c2-a874d5952e24","D","

A resposta é 4.

",{"_22":77,"_60":78,"_62":79},"6951e22e-1048-417a-af88-ae236602ebab","E","

A resposta é 5.

","solution_explanation","statement","

Problema: Encontre o valor de \$ \\sum_{n=1}^{\\infty} \\frac{n}{3^n} \$.

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57. (UFRGS-RS) Na promoção de um produto cujo custo unitário é de R$ 5,75 se lê: \"Leve 3, pague 2\". Usando as condições da promoção, a economia máxima que poderá ser feita na compra de 188 itens deste produto é:

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