Question

RUSH!
The sum of finite geometric series
1+5+25+125+...+5^9

answer please???

Answer 1

a1=1,r=5
sum = a1(1-r^n)/1-r

Answer 2

here a1=1 and r=5 and n=10
use the formula for summation of GP with r>1
Sn=1(5^10 -1) / (5-1)=1/4 * (5^10 -1)

Answer 3

I TRy but the answer i got is 488281. something : l

Answer 4

S = a((1-r^n) / (1-r))
= 1(1-5^10) / (1-5)
= 2,441,406

Answer 5

thank u ;)