## Try It Now

Work these exercises to see how well you understand this material.

### Exercises

- Calculate the following series:

- Rewrite the following without summation sign for n = 3. It is not necessary that you understand or expand the notation at this point. .
- For any positive integer k, let A
_{k}= {x ∈ Q : k − 1 < x ≤ k} and B_{k}= {x ∈ Q : −k < x < k}. What are the following sets?

- The symbol is used for the product of numbers in the same way that is used for sums. For example, . Evaluate the following:

Source: Al Doerr and Ken Levasseur, http://faculty.uml.edu/klevasseur/ads-latex/ads.pdf

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