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### Course: Class 10 (Old) > Unit 5

Lesson 4: Sum of first n terms of an AP- Arithmetic series intro
- Arithmetic series formula
- Worked example: arithmetic series (sum expression)
- Finding first term and common difference when sum is given
- Finding number of terms when sum of an arithmetic progression is given
- Sum of n terms (intermediate)
- Sum of n terms (advanced)
- Comparing arithmetic progressions

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# Comparing arithmetic progressions

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