9231 P11 - Jun 2017 - Q1 - 5 marks
6230
It is given that \(\sum_{r=1}^{n} u_{r}=n^{2}(2 n+3)\), where \(n\) is a positive integer.
(i) Find \(\sum_{r=n+1}^{2 n} u_{r}\).
(ii) Find \(u_{r}\).
Solutions locked. Please sign in with access to view them.