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[" The sum of n terms of an A.P.is given...

[" The sum of n terms of an A.P.is given by "],[S_(n)=(3n^(2)+4n)." Its "r" th term is: "],[[" (a) "(4r+3)," (b) "(3r^(2)+4r)],[" (c) "(5r+2)," (d) "(6r+1)]]

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