Question

What is the sum of the geometric sequence 1, 3, 9, … if there are 12 terms?

Answer 1

i got 292,524

Answer 2

am i right?

Answer 3

\[ \color{Black}{\Rightarrow S = a \times {1 - r^n \over 1 - r} }\]

Answer 4

\( \color{Black}{\Rightarrow 1 \times \Large {1 - 3^{12} \over 1 - 3}}\)

\( \color{Black}{\Rightarrow \Large {-531440 \over-2} }\)

Answer 5

-265720! ah, I got it! thanks for showing me!

Answer 6

Not the negative sign, but the rest is correct!