[計量] problem solving
If x and y are integers and xyy is a positive odd integer,
which of the following must be true?
Ⅰ. xy is positive.
Ⅱ. xy is odd.
Ⅲ. x + y is even.
(A) Ⅰ only
(B) Ⅱ only
(C) Ⅲ only
(D) Ⅰ and Ⅱ
(E) Ⅱ and Ⅲ
Ans:E
我有疑問的是Ⅲ
若x,y其中一奇數一偶數不是就不符合,怎還會成立?
感謝解答~m(_ _)m
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