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What are the calculation rules of ∑ formula?
Sum rule: ∑ j =1+2+3+…+N. Capital σ is used for mathematical sum symbols, such as ∑Pi, where i= 1, 2,3, ... t is the sum ...+angle of P 1+P2+P3. ∑ formula calculation: the number indicating the beginning and end. For example, the following n=2, and the number 10 above means from 2 to 10.

Formula: ∑ AI (I = 1 ...), where ∑ stands for continuous addition, right-handed writing formula, and subscript writing range. ∑ is called continuous plus sign, which means: a1+a2+...+an = n.

∑ (summation symbol)

English name: Sima.

Chinese name: Sima. (capital σ, lowercase σ)

The eighteenth Greek letter. In Greek, if the last letter of a word is lowercase sigma, what should it be written as? This letter is also called final sigma(Unicode: U+03C2). In modern Greece, this number stands for 6.

Capital σ is used for mathematical summation symbols, such as ∑Pi, where i= 1, 2, ..., t, which is the sum of P 1+P2+ and ...+angle. Lowercase σ is used for statistical standard deviation. Both the с of Cyrillic alphabet and the S of Latin alphabet are derived from Sigma.

It also means summation, which means ∑ j =1+2+3+…+n.

The usage of ∑:

Where I stands for the lower bound, n stands for the upper bound, and k starts from I and goes all the way to n, all of which add up.

∑ i can also be expressed as the sum of I, which is a variable.

∑∑, sigma, the Greek letter (pronounced sigma) stands for "sum" in mathematics, for example:

∑pi, I is 1, 2, ..., t.

Is to find the sum of p 1+p2+ and ...+angle.