Question

If n is an odd integer, all of the following are odd EXCEPT
(A) n - 2
(B) 2n + n
(C) n2 + n
(D) (n + 2)2

Answer 1

even+odd=odd
odd+odd=even

odd*odd=odd
even*odd=even

so, A,B,D are all odd

C is even because n^2 is odd and n is odd