Summation
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Last updated 10:32 PM on 11/21/25
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Sigma Notation
when writing a sigma notation, there are three ‘inputs’, the number above (in this case 6), the variable to the left (in this case i), and the number below (in this case 2). what this means is to count from 2 to 6 (so 2, 3, 4, 5, 6) and then add all the numbers up (so 2+3+4+5+6), which equals 20.
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Summation Formulas
to find the answer to a sigma notation, you can use the formula \frac{n\left(n+1\right)}{2} , which basically means “multiply the top number of your notation by itself + 1 (so 11 × 12 for example) and divide by 2" so if n was 11, the answer would be 66
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