How to Write Summations in LaTex

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    • 1). Open your LaTeX document.

    • 2). Position the cursor at the point where you want to insert the summation.

    • 3). Type the following code:

      \[sum_{i=1} ^n a_i\

      The "sum_" tells LaTex that you want to write a summation; "i=1" is the index of summation, meaning it is the starting number of the equation. You can replace the "1" with any number. The "^n" represents the upper bound of summation, which is the last number in the sequence. The equation will stop computation when it reaches n. You can replace n with any number. As an example, if you kept the "i=1" and replaced n with 4, the equation would be 1+2+3+4=10.

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