Posted by **Please Help** on Saturday, June 12, 2010 at 3:34pm.

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.

## Answer this Question

## Related Questions

- Maths - Express the sum using summation notation: 1 - 1/2 + 1/3 - 1/4 + 1/5...
- Maths - Express the sum using summation notation: 1 - 1/2 + 1/3 - 1/4 + 1/5...
- Algebra - Express the sum below using summation notation. Use 1 as the lower ...
- Calculus need help badllyyy! - Use the expressions for left and right sums and ...
- Math help quickly - Use the expressions for left and right sums and the table ...
- MATH - Expand f(x)=ln (1+x/1-x) in a Taylor Series about x=0. You must express ...
- math - Hi. I'm having trouble with the summation of n from i=2 of ((2^n-i)(2^n...
- Precalculus - Find the sum of 20 (summation notation symbol)k=1 then (3k-5) If ...
- math - 2+2^2 over 3 + 2^3 over 3^2+....... + 2^n+1 over 3^n. Express each sum ...
- Probability - Consider three random variables X, Y, and Z, associated with the ...

More Related Questions