17、If x and y both positive numbers,is at least one of them even?
(1)x+y is odd (2)x-y is odd
如果X,Y都是分数,那么答案是不是不对了?POSITIVE NUMBERS BUT NOT POSITIVE INTEGERS.
sorry ,i make a concept fallacy,if x,y are positive,so the answer is e,right?blackhorse.
i always confuse about the category of the numbers,could you tell me a lot?
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