SOLUTION: {{{S=a+ar+ar^2+ar^3+ar^(n-1)}}}, what happens to the sum when r=1?

Algebra ->  Sequences-and-series -> SOLUTION: {{{S=a+ar+ar^2+ar^3+ar^(n-1)}}}, what happens to the sum when r=1?      Log On


   

Question 957525: S=a%2Bar%2Bar%5E2%2Bar%5E3%2Bar%5E%28n-1%29, what happens to the sum when r=1?
Answer by satyareddy(3) About Me  (Show Source):
You can put this solution on YOUR website!
when r=1
S=a%2Bar%2Bar%5E2%2Bar%5E3%2Bar%5E%28n-1%29
=>a+a+a+a+a=5a