SOLUTION: Write the equation of this geometric sequence and find the value of the 9th term. 1/3, 1, 3, 9... F(n)= F(9)=

Algebra ->  Average -> SOLUTION: Write the equation of this geometric sequence and find the value of the 9th term. 1/3, 1, 3, 9... F(n)= F(9)=      Log On


   

Question 1177327: Write the equation of this geometric sequence and find the value of the 9th term.
1/3, 1, 3, 9...
F(n)=
F(9)=
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
1/3, 1, 3, 9... 
a%5Bn%5D+=+a%5B1%5D%2Ar%5E%28n-1%29
a%5B2%5D+=%281%2F3%29%2Ar%5E1+=+1  r = 3
a%5Bn%5D+=+%281%2F3%29%2A3%5E%28n-1%29
a%5B9%5D+=+%281%2F3%29%2A3%5E%288%29 = 2187

Wish You the Best in your Studies.