Question 967404
The general rule is {{{((-1)^n)/n}}}


Basically it's {{{1/n}}} but we throw in {{{(-1)^n}}} to have the terms alternate in sign. 


Note: n is a positive integer (ie a whole number that starts at n = 1)


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Example: the third term is -1/3. Plug in n = 3 and you get...


{{{((-1)^n)/n = ((-1)^3)/3 = -1/3}}}


which matches with the third term given. Try other values of n to confirm the expression.