42+637+...要使这三个数的和为奇数,第三个加数应该是奇数还是偶数,为什么

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偶+奇=奇
所以第三个加偶数。

奇+奇=偶
偶+偶=偶
奇+偶=奇
42+367=409 为奇数,+第三个数,和为奇数,
所以第三个数为 偶数.