Arithmetic series intro | Mathematics III | High School Math | Khan Academy
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Sal explains the formula for the sum of a finite arithmetic series. Created by Sal Khan.
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High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.
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