SOLUTION: Please help me solve this problem, Write an explicit formula for the nth term of the geometric sequence. -1/5, 1/10, -1/15, 1/20,....

Algebra ->  Geometry-proofs -> SOLUTION: Please help me solve this problem, Write an explicit formula for the nth term of the geometric sequence. -1/5, 1/10, -1/15, 1/20,....      Log On


   

Question 50941: Please help me solve this problem, Write an explicit formula for the nth term of the geometric sequence. -1/5, 1/10, -1/15, 1/20,....
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Write an explicit formula for the nth term of the geometric sequence. -1/5, 1/10, -1/15, 1/20,....
-------------------
r=(-1/15)/(1/10)= -2/3
a(n)=ar^(n-1)
a(n)=(-1/5)(-2/3)^(n-1)
Cheers,
Stan H.