If W is a positive integer, which of the following must be odd? Choose the correct choice from the following answers
A) x+1	B) W^2W	C) W^2+W+1	D) x^2−1	E) 3x^2−3
A. W+1 = can be odd or even. Since O + O =E or E + O = O   B. W^2 + W = W(W+1). Since from the above derivation we already know the term W+1 can be Odd or Even, directly substitute here. W(ODD) = Even (When W is Even) or W(EVEN) = EVEN [When W is ODD]   C. Here's the answer. Since we know the term W^2 + W can always take a EVEN number, EVEN + 1 = ODD   Hence W^2+W+1.
<result>C</result>
If W is a positive integer, which of the following must be odd?