Hello,Originally Posted by Nimmy
to 2.) I hope you meant . Then you can transform this term to:
and thats (n-1)*n which doesn't converge for n to infinity.
to 3. Split the summation into two sums: In 1st sum n is even and the numbers are positive, in the 2nd sum n is odd and all numbers are negative. Calculate both sums separately.
This sum must converge according to the convergence criterium of Leibniz.