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P(x) = 2(x-1) + 27 = 2x + 25
Sumando de x=1 a x=n
(n)(n+1) + 25n = 3880
n^2 + 26n - 3880 = 0
N = techo(Max(n)) = 51
Se necesitan un total de 51 meses para poder saldar la cuenta.