Question

find the sum of the finite geometric series by using the formular for Sn

1-1/3+1/9-1/27+1/81-1/243+1/729

Answer 1

divide the sequence as follows...
[1+1/9+1/81+1/729]-[1/3+1/27+1/243]

thes r 2 diff gps ....
solve for their sum as individuals nd subtrat it

Answer 2

to find the finite

Answer 3

yes there r three terms in each ...
=> n=3 r in each case is 1/9

a in case 1 is = 1
nd case 2 = 1/3

use theformula Sn = a[1-(r^n)]/(1-r)

Answer 4

I got it thank u soo much

Answer 5

no problem :)

Answer 6

You could also use (1-r^n)/(1-r) with a ratio of -1/3 (a is 1) which will give u the same result.