Question

Find S15 for the geometric series 72 + 12 + 2 + 1/3 +…

Answer 1

R=??

Answer 2

1/6....
that doesn't sound right but

Answer 3

u r correct

Answer 4

if r<1

Answer 5

\[sn = a[1-r^n/(1-r)]\]

Answer 6

OH no wonder

Answer 7

u got it now there r two formula for finding the gs sum

Answer 8

nw u can solve ...))

Answer 9

You are perfect Yahoo :D