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[" 10.If in an A.P.,"S(n)=n^(2)p,S(m)=m^...

[" 10.If in an A.P.,"S_(n)=n^(2)p,S_(m)=m^(2)p" and "S_(r)" denotes the "],[" sum of "r" terms of the A.P.,then is equal to "],[[" (a) "(1)/(2)p^(3)," (b) "mnp],[" (c) "p^(3)," (d) "(m+n)p^(2)]]

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