16 views

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

1. divisible by $3$
2. not divisible by $3$
3. divisible by $9$
4. None of these

recategorized | 16 views

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

by Boss (21.7k points)

+1 vote