Answer
$a_n=\dfrac{1}{n}$;$n=1,2,3,4,...$
Work Step by Step
Since, we have $1,\dfrac{1}{2},\dfrac{1}{3},\dfrac{1}{4}...$
or, $\dfrac{1}{1},\dfrac{1}{2},\dfrac{1}{3},\dfrac{1}{4}...$
Here, $n=1,2,3,4,...$
which can be represented as: $a_n=\dfrac{1}{n}$;$n=1,2,3,4,...$
