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# Unit 9: Series

## About this unit

This unit explores geometric series, which involve multiplying by a common ratio, as well as arithmetic series, which add a common difference each time. We'll get to know summation notation, a handy way of writing out sums in a condensed form. Lastly, we'll learn the binomial theorem, a powerful tool for expanding expressions with exponents.

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### Practice مشق

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**Series**with these NaN questions.