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[" (a) "(3)/(1^(2))+(5)/(1^(2)+2^(2))+(7...

[" (a) "(3)/(1^(2))+(5)/(1^(2)+2^(2))+(7)/(1^(2)+2^(2)+3^(2))+......," is "],[[" (a) "(6n)/(n+1)," (b) "(9n)/(n+1)],[" (c) "(12n)/(n+1)," (d) "(3n)/(n+1)]]

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