Which of the following describes the set of all possible values of the positive integer k such that, for each positive odd integer n, the value of ~$n \over k$~ is midway between consecutive integers?
All positive integers greater than 2
All prime numbers
All positive even integers
All even prime numbers
All positive even multiples of 5
题目要求奇数除以正数是结果是含0.5的,那么只有2这个偶数质数复合条件。
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