0 votes 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 Quantitative Aptitude isi2016-dcg quantitative-aptitude number-system remainder-theorem + – gatecse asked Sep 18, 2019 • recategorized Nov 18, 2019 by Lakshman Bhaiya gatecse 333 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes Ans: B) Reference: https://math.stackexchange.com/questions/630742/whats-the-explanation-for-why-n21-is-never-divisible-by-3/630998#:~:text=There%20are%20proofs%20on%20this,are%20either%20wrong%20or%20overcomplicated.&text=Since%20one%20of%20those%20first,1%20is%20divisible%20by%203. nocturnal123 answered Aug 21, 2020 nocturnal123 comment Share Follow See all 0 reply Please log in or register to add a comment.