Hi Kirana,
You can study AP for Class 10 from here https://www.teachoo.com/subjects/cbse-maths/class-10th/ch5-10th-arithmetic-progressions/
and for Arithmetic Progressions of Class 11, please visit Chapter 9 Class 11 here https://www.teachoo.com/subjects/cbse-maths/class-11th/ch9-11th-sequences-and-series/
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