Telescoping explanation does not match

[davidfarmer]

After Example 2.4.2, the explanation about telescoping (group things that are 0) does not apply to the specific example prior to the explanation.

Also, when giving the first example of telescoping, I think it is better to write out the sequence without grouping, and then put in the parentheses that show the telescoping.

Also, not sure why every "third term" is mentioned.

In the solution to example 2.4.3, you may with to explicitly rearrange and regroup the terms to show the telescoping.