tmua.me papers

tmua.me Medium Set B Paper 2 · Q17

Paper 2Sequences & series

What is the value of

∑n=1202nn4+n2+1 ?\sum_{n=1}^{20}\frac{2n}{n^4+n^2+1}\,?
A1421\dfrac1{421}
B210421\dfrac{210}{421}
C380381\dfrac{380}{381}
D400401\dfrac{400}{401}
E420421\dfrac{420}{421}
F11

Read the questions freely. Sign in to check your answer, see the worked solution and save your progress.