0 votes

For all the natural number $n \geq 3, \: n^2+1$ is

- divisible by $3$
- not divisible by $3$
- divisible by $9$
- None of these

0 votes

if we take $n=4$ then $n^2+1=17$ which is not divisible by $3$ and $9$.

So option a and c are eliminated.

Option B. is correct option.

For proof refer this