its a power series. You may want to look into this website:
http://appsci.queensu.ca/courses/APS...ments/nops.pdf
but to simple things out, here's a general equation that you can use c/(1-x)
where c is 5 in this case, and x is 1/(x+1) and something like that.
and that is as far as I remember from my calculus class...lol
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