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Segundo término: a*r
Tercer término: a*r^2 = 18
Sexto término: a*r^5 = 486
a*r^2*r^3 = 486
(a*r^2)*r^3 = 486
18*r^3 = 486
r^3 = 486/18
r^3 = 27
r^3 = 3^3
r = 3
Tercer término: a*r^2 = 18
a*3^2 = 18
a*9 = 18
a = 18/9
a = 2
Hallando los 8 primeros términos:
2; 6; 18; 54; 162; 486; 1458; 4374
Sumando:
2+6+18+54+162+486+1458+4374
= 6560