Posted by NADIA on .
If the nth partial sum of
an is sn=(3n2)/(n+1)
what is an when x>1?
and what is the sum of an?

calculus 
Steve,
I assume that Sn = sum(1..n) An, so Sn > 3
Dunno where the x comes from, but if you mean when n > 1,
An = Sn  s(n1)
= (3n2)/(n+1)  (3(n1)2)/(n1+1)
= 5 / n(n+1)