## lindseyharrison 2 years ago What is the sum of the geometric sequence 1, 3, 9, … if there are 12 terms? 292,524 265,720 139,968 104,976

1. timo86m

ooh i like these

2. timo86m

a=1 r*a^0+r*a^1+r*a^2...

3. timo86m

oh wait switch a and r the r has the ^ not the a

4. ParthKohli

$S = {1 - r^n \over 1 - r}$

5. lindseyharrison

B?

6. timo86m

265720

7. timo86m

YES :)

8. lindseyharrison

yay!! Thank you :)