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S:-3,3,-3,3,-3,3,...
S is a sequence of integers in which -3 and 3 alternate, as shown. If the average (arithmetic mean) of the first n terms of S is $$-\frac{1}{5}$$, what is the value of n ?
n=_____
S is a sequence of integers in which -3 and 3 alternate, as shown. If the average (arithmetic mean) of the first n terms of S is $$-\frac{1}{5}$$, what is the value of n ?
n=_____
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以上解析由 考满分老师提供。
