There is a typo . . .
Show that: .
We have: .
This is geometric series with first term
. . common ratio and terms.
The sum is: .
I have no idea how to do this because the book I'm reading doesn't show me how:
A x sum of 1/(1+r)t where t goes on for however long, apparently equals A/r x [1 - 1/(1+r)t ]
how do you get there?
I'd be so thankful for someone to show me )