If a given number ,n, is an odd positive integer, which of the following must then be an even negative integer? Select:
A) -2n - 1
B) n^-2
C) n^2
D) -2n^2
E) 2n - 4n
Answer: 2n - 4n   A: -2n - 1 = negative odd   B: n^-2 = positive   C: n^2 = positive   D: -2n ^ 2 = positive even   2n - 4n: 2n - 4n = -2n = even and negative
<result>E</result>
If a given number ,n, is an odd positive integer, which of the following must then be an even negative integer?