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 ?
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 ?