Sum of converging telescoping series

How can the answer to this converging telescoping series be found on the 89 using the sequences and series module of calculus made easy ?

Straightforward , under f2 C enter this series as 2/(n^2-1) with a starting value of N=2
Notice the series is undefined when n=1.

Finally , your answer comes to be 1.5 or 3/2

Of course, this tool finds the sum of any converging series. To test for convergence you may just use the all on one convergence tester under F2 that will tell you step by step whether your series converges or diverges.

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