题目信息
If the sum of n consecutive integers is 0,which of the following must be true?
I. n is an even number.
II. n is an odd number.
III. The average (arithmetic mean) of the n integers is 0
I. n is an even number.
II. n is an odd number.
III. The average (arithmetic mean) of the n integers is 0
A:I only
B:II only
C:III only
D:I and III
E:II and III
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正确答案：
E:II and III
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