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You can insert symbols by typing the symbol's character code and then pressing the Alt+X key combination. For example, the character code for sigma is 2211: Type 2211 in your document and then press Alt+X. The number 2211 is magically transformed into the sigma sign
Sigma Notation. This symbol (called Sigma) means “sum up” I love Sigma, it is fun to use, and can do many clever things.
0:35 4:25 Suggested clip How to write the sum in sigma notation given a geometric sequence YouTubeStart of suggested client of suggested clip How to write the sum in sigma notation given a geometric sequence
0:00 3:52 Suggested clip Finding the sum or an arithmetic series using summation notation YouTubeStart of suggested client of suggested clip Finding the sum or an arithmetic series using summation notation
i=3. Ii + 1 = 34 + 45 + 56. I=1. I(i+1) = 1×2 + 2×3 + 3×4 = 20. N=1. (2n+1) = 3 + 5 + 7 + 9 = 24. And we can use other letters, here we use i and sum up i A (i+1), going from 1 to 3: n=1. N2 = 12 + 22 + 32 + 42 = 30. We can add up the first four terms in the sequence 2n+1:
Multiply the amount of numbers in the series by the sum obtained from each column addition. For example, you multiply 10, the amount of numbers from one to 10, by the average sum of 11, obtaining 110. Divide the product by two. For example divide, 110 by two.
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