series convergence/divergence Watch
Which of the summations you are given is the right one for this question? Can you simplify what you have after substituting for z?
Also, if you have any working, please feel free to upload.
© Copyright The Student Room 2017 all rights reserved
The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.
Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE