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Not understood formula derived for agp for summation of agp

Not understood formula derived for agp for summation of agp

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Grade:11

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4404 Points
5 years ago
here first s is written , then we subtracted rs from s by moved one term thus term started getting cancelling
please tell in which step you have doubt

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