If (x + 1) times (2x + 1) is an odd integer, then x must be Choices.
A) an odd integer B) an even integer C) a prime number D) a composite number E) a negative integer
(x + 1) times (2x + 1) means (x + 1) * (2x + 1)..   (x + 1)*(2x + 1)= 2x^2+3x+1...   for 2x^2+3x+1 to be odd, 3x+1 should be odd..   hence 3x should be even, which further leads to x as even..   so x is even integer..   ANSWER:an even integer
<result>B</result>
If (x + 1) times (2x + 1) is an odd integer, then x must be