Question

If '$n$' is a negative integer, which of the following must be a positive integer?

• A. $n+2$
• B. $2n$
• C. $n^2-5$
• D. $n^2+1$

Answer 1

The correct option is D $n^2+1$

if $n$ is negative number

$n^2$ is positive irrespective of the magnitude.

When $+1$ is added to a positive number, it will remain positive.

Hence, Option D is correct.