Question

What is a ∑ ??
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Answer 1

Step-by-step explanation:

This is called summation.

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Answer 2

Answer:

The symbol ∑ indicates summation and is used as a shorthand notation for the sum of terms that follow a pattern. For example, the sum of the first 4 squared integers, 12+22+32+42, follows a simple pattern: each term is of the form i2, and we add up values from i=1 to i=4.

Step-by-step explanation:

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