SOLUTION: find the sum of each of the following G.p's: (a)6,12,24,... to 10 terms (b)1,-0.5,0.25,0.125... to 20 terms.

Algebra ->  Sequences-and-series -> SOLUTION: find the sum of each of the following G.p's: (a)6,12,24,... to 10 terms (b)1,-0.5,0.25,0.125... to 20 terms.      Log On


   

Question 1122507: find the sum of each of the following G.p's:
(a)6,12,24,... to 10 terms
(b)1,-0.5,0.25,0.125... to 20 terms.
Found 2 solutions by mananth, ikleyn:
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
S%5Bn%5D=+a%5B1%5D%2A%28%281-r%5En%29%2F%281-r%29%29
S%5B10%5D=+6%2A%28%281-2%5E10%29%2F%281-2%29%29
S%5B10%5D+=+6138
Similarly the next one

Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
.
find the sum of each of the following G.p's:
(a) 6,12, 24, ... to 10 terms
(b) 1,-0.5, 0.25, 0.125 ... to 20 terms.
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What is presented in part  (b),  is not a geometric progression.

It is a rude  MISTAKE  to call it a  " geometric progression ",  while it is not.