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The sigma sign (Σ, which resembles a sideways M) represents the sum of. Sometimes there are numbers above and below the sigma sign. For example, below the sigma sign can be written x=2, and above the sigma sign can be written 6. This signifies the sum of the numbers between the number below, and the number above. If there is a formula alongside this, it signifies that you should apply the formula to each number, and add the numbers together (hence the Σ, sum of, sign).

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Q: In math what does the sideways M thing mean?
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