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Course: Class 10 Math (India) - Hindi > Unit 5
Lesson 4: Sum of first n terms of an AP- Arithmetic series intro (Hindi)
- Arithmetic series formula (Hindi)
- Worked example: arithmetic series sum expression (Hindi)
- 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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Arithmetic series formula (Hindi)
The sum of the first n terms in an arithmetic sequence is (n/2)⋅(a + l). It is called the arithmetic series formula.