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http://www.google.com.lb/url?url=http://www.columbia.edu/itc/sipa/math/summation.html
https://en.wikipedia.org/wiki/Summation
https://www.khanacademy.org/math/algebra2/sequences-and-series/alg2-sigma-notation/v/sigma-notation-sum
https://www.khanacademy.org/math/ap-calculus-ab/ab-integration-new/ab-6-3/a/review-summation-notation
https://www.mathsisfun.com/algebra/sigma-notation.html
https://www.mathsisfun.com/numbers/sigma-calculator.html
https://en.wiktionary.org/wiki/%25CE%25A3
https://www.youtube.com/watch%3Fv%3DhEPk36Yncxg
https://www.youtube.com/watch%3Fv%3Dzg-gxekFIA8
https://fsymbols.com/signs/sigma/
https://www.quora.com/What-is-the-symbol-sum
https://www.hec.ca/en/cams/help/topics/The_summation_symbol.pdf