Hi everyone,

I am struck in an expansion. Hope someone could help me in this expansion.

The expansion that I have is

1+(2^2)(r^2)+(3^2)(r^4)+(4^2)(r^6)+....... , 1+(2^4)(r^2)+(3^4)(r^4)+(4^4)(r^6)+....... , ......

Can we find geometric progression for this expansion.

Thank you .....