If x is an integer and x + x^2 + x^3 is odd, which of the following must be even? Pick one
A) x
B) x^2
C) x^3
D) 3x
E) x + x^2
x + x^2 + x^3 = odd   Since each is a power of x, x has to be odd   On checking the options, only   x + x^2 = odd + odd = even   Correct option: x + x^2
<result>E</result>
If x is an integer and x + x^2 + x^3 is odd, which of the following must be even?