Q$4(3$pt$).$ Sum the first n terms in the series:

$1+\frac{1}{4}+\frac{1}{9}+$cdots$+\frac{1}{n^2}$

and store the result in a new variable $f.$ Your code should work for any $n.$ Fun facts: Euler found that as $n,$ the sum converges to $\frac{{}^2}{6}.$