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Summations and Sigma Notation

Y = Σ X
What does each term mean. Why do we have a Y?


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This sign is to make the summation of X. Now I explain each term in the form.
1. X is on the right side of the sigma sign. It means that X is the ...

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Sigma notation is explained. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.