Answer
Divergent series
Work Step by Step
Given: $\Sigma_{n=1}^\infty \dfrac{n(n+1)}{(n+2)(n+3)}$
and $\lim\limits_{n \to \infty} \dfrac{n(n+1)}{(n+2)(n+3)}=\lim\limits_{n \to \infty} \dfrac{n^2(1+\dfrac{1}{n})}{n(1+\dfrac{2}{n})(1+\dfrac{3}{n})}=\lim\limits_{n \to \infty} \dfrac{n^2(1+\dfrac{1}{n})}{n(1+\dfrac{2}{n})(1+\dfrac{3}{n})}$
Now, we have $\dfrac{\lim\limits_{n \to \infty} 1+\lim\limits_{n \to \infty} \dfrac{1}{n}}{\lim\limits_{n \to \infty}
(1+\dfrac{2}{n})+ \lim\limits_{n \to \infty} (1+\dfrac{3}{n}){}}=\dfrac{1+0}{1 \cdot 1}$
or, $=1$
Thus, it is a divergent series in accordance to nth-Term Integral Test.