[計量] OG12 PS-40
Question: If n is an integer, which of the following must be even?
(A) n+1
(B) n+2
(C) 2n
(D) 2n+1
(E) n^2
Answer: (C)
雖然說C的確是最好的答案了，可是0不是也是整數嗎?這樣代進去不成立吧?
有請高手解惑~~謝謝!!
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