posted by Anonymous .
Express the sum using summation notation:
1 - 1/2 + 1/3 - 1/4 + 1/5 - ... (to 3n terms)
If I'm doing this right so far, with k=1 (the number on bottom of the sigma), the equation after the sigma would be
((-1)^(k+1)) / k
I'd be able to figure out the term on top of the sigma, n, if I knew the value, but I don't understand how to get it because of the way it is worded. Please help, and correct me if what i've done so far is wrong.
they did not tell you what n is so you can say 3n