When 24 is divided by the positive integer n, the remainder is 4. Which of the following statements about n must be true?
I. n is even.
II. n is a multiple of 5.
III. n is a factor of 20
III only
I and II only
I and III only
II and III only
I, II, and III
我当时的思路是15也是5的倍数,但是24除以15余9 所以二的都排除。。。。。
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