in reply to [OT] math fulguration
Yes, as jo37 said, it is known, though they meant geometric series – the binomial formula would have binomial coefficients.
Note: The wikipedia formula is a more general form and written a different way. Divide out the "a" then note that (1-xⁿ)/(1-x) = (xⁿ-1)/(x-1). Then solve for xⁿ.
Good Day,
Dean
In Section
Seekers of Perl Wisdom