Question

For a G.P. if tı=8, t4=64 then S7 =​

Answer 1

Answer:

$2340 \frac{3}{7}$

Step-by-step explanation:

t1=8=a

t4=64=ar^3

or,r=4

therefore,s7={4^7-1}/8-1

=(16384-1)/7

=2340.426