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S = a1 (r^n - 1) / (r - 1) Debemos hallar el número de términos.
an = a1 . r^(n - 1); luego 1536 = 3 . 2^(n - 1);
2^(n - 1) = 1536 / 3 = 512; para hallar n se recurre al cálculo logarítmico:
(n - 1) . log(2) = log(512); n - 1 = log(512)/log(2) = 9
luego n = 10
S = 3 . (2^10 - 1) / (2 - 1) = 3069
Finalmente agregamos el 1 y nos queda S = 3070
Saludos Herminio