Question

What is the sum of the geometric sequence 1, 3, 9, … if there are 10 terms?

Answer 1

A=1 ,R=3 ,n=10
where a= first term ,R=common ratio ,n=number of all terms
Use the rule of Sum :
\[Sn=\frac{a(r^n-1)}{r-1}\]

Answer 2

LOL ! , U didn't get it !
Just plug instead of each letter its number !

Answer 3

so its 29,524?

Answer 4

Yes

Answer 5

thanks