Question

Calcule a soma dos 50 primeiros termos da sequencia (3,6,12...)

Answer 1

$Sn = \frac{a1.( q^{n} -1)}{q-1} =\ \textgreater \ S50 = \frac{3( 2^{50} -1)}{2-1} =\ \textgreater \ S50= 3(1125899906842624-1)$

$S50 = 3.(1125899906842623)=\ \textgreater \ S50=3377699720527872 ok$