Answer
$a_n=\dfrac{1}{n(n+1)}$
Work Step by Step
The pattern shows that:
(1) The numerator is always 1.
(2) The denominators involve the product of two numbers: the term number $n$ and the next integer $n+1$.
Thus, the $n^{th}$ term of the sequence is:
$a_n=\dfrac{1}{n(n+1)}$