GRE数学题3The sum of 4 integers is even.the number of these integers_英语解答

GRE数学题3
The sum of 4 integers is even.the number of these integers that are odd与4比较大小
求算法与解释
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人气：116 ℃　时间：2020-08-11 08:44:51

解答

3 possibilities:
2 even,2 odd;
4 even;
4 odd;
so,