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[" (iii) "(a-b)^(2)+(a^(2)+b^(2))+(a+b)^...

[" (iii) "(a-b)^(2)+(a^(2)+b^(2))+(a+b)^(2)+...+[(a+b)^(2)+6ab]],[" 3.Find the sum of first "n" natural numbers."]

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