Question

What is the sum of the geometric series ...

A.15,658
B.6,138
C.12,276
D.756

Answer 1

\[\sum_{n = 1}^{10} 6(2)^x\]

Answer 2

@Hero Help Please ?

Answer 3

@Hero I Didnt Block You , But Ok Thanks !

Answer 4

@satellite73 Help ?

Answer 5

@JamesJ Help

Answer 6

@AccessDenied Help

Answer 7

What is the sum in general of a geometric series?

a + ar + ar^2 + ... + ar^(n-1) = ...

Answer 8

ar ? what does that variable mean

Answer 9

a and r are variables

Answer 10

I know , representing what ?

Answer 11

numbers in a general geometric series.

I'm asking you what is the formula for the sum of geometric series so you can use it in this problem.

To cut to the chase

\[ a + ar + ar^2 + .... + ar^n = \sum_{j=0}^n ar^n = a \frac{r^{n+1} - 1}{r - 1} \]

Now apply this in your problem. Be careful about what is a and r in your problem and/or the indices

Answer 12

\[ a + ar + ar^2 + .... + ar^n = \sum_{j=0}^n ar^j = a \frac{r^{n+1} - 1}{r - 1} \]