求助

albertes

201. 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  of the N integers is 0.
答案：II and III.
我认为N既可以是odd No. 也可以是even No.
如：-2，-1，0，1，2
或：-3，-1，1，3

dreadpower

楼主，题目里是说consecutive integers, 那么就不能是第二种情况了，-3，-1，2，3并不连续

所以N不是even number