Question 733216
the sum of an infinite geometric sequence =a{1-r^(n+1)}/(1-r) when r<1
                                          =a{r^(n+1)-1}/(r-1) when r>1
but when r=1  the the denominator becomes Zero & the sum will be indeterminant
so the sum of an infinite geometric sequ does not exist if the constant ratio is equal to one not >1