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Complete the chart.
|________________||the large, stylized capitol E that means, approximately, "the sum of"|
|________________||the expression being summed in a sigma|
|________________||when a series has a limit, and the limit exists|
|________________||when a series does not have a limit, or the limit is infinity|
Properties of Sigma
Label the sigma, index, summand, and limit:
The above can be read as "find the _____ of the first ______ terms of the series, where the nth term is ____.
What does the sum above add to? __________
True or false: You can factor a coefficient out of a sum. ____________
Express the Sum using Sigma Notation:
Find the series of numbers indicated and evaluate the summations:
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Gauss' Formula allows us to add together the first n positive integers:
.In your own words, describe how Gauss' Formula works. _________________________________________________________________________
Explain how to use your calculator to solve
Keep in mind Gauss' Formula can also be written as
Calculate the sums of the given series. You may use addition of individual terms or a series sum formula.
- The first eight numbers of an arithmetic sequence add up to 604. The next eight numbers added up equal 156. Find the first number and the common difference in the sequence.
The first number in an arithmetic sequence is 80. Find the common difference if we also know that
s9is eighteen times a11
anis an arithmetic sequence with a1=1. Find the second number if we know that the sum of the first five numbers is one-fourth of the sum of the next five numbers.
(an)=78,75,72,69...Find a150and s150