Question

30. If N us a non-zero integer, which of the following must be an integer?

a.
16/N
b. (n²+1)/N
C. N²

Answer 1

c is the correct answer. If N is a non-zero integer, then N^2 is a non-zero integer.

16/5 is not an integer, so a is wrong.

(5^2 + 1)/5 = 26/5 is not an integer, so b is wrong.