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[" Tanti "A.P." an "n,2n,787" 3n "49" ? ...

[" Tanti "A.P." an "n,2n,787" 3n "49" ? "cm" .Why "$749" : "S_(1),S_(2)" 3ft "S_(3)" st at incrors "],[" for "S_(3)=3(S_(2)-S_(1))],[" [ lif the sum of "n,2n" and "3n" terms of an "A.P." be "S_(1),S_(2)" and "S_(3)],[" respectively,show that "S_(3)=3(S_(2)-S_(1)).]," [NCERT] "]

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