The whole chapter in one shot
Galaxy of Maths · YouTube
Both formulas and the standard question types in a single sitting.
Arithmetic Progression
Chapter 3 of Algebra, SSC Std 10 (English Medium). A short revision read — free, no sign-up.
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Hand-picked free resources for this exact chapter.
Lecture one, from the beginning
JR Tutorials · YouTube
Starts from what makes a sequence an AP before either formula appears.
Practice Set 3.1 solved
Pawan Wagh Academy · YouTube
The first textbook practice set worked sum by sum.