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[" (a) "(n(n+1))/(2)quad " (b) "2n(n+1)q...

[" (a) "(n(n+1))/(2)quad " (b) "2n(n+1)quad " (c) "(n(n+1))/(sqrt(2))quad " id "1],[" The "n^(" th ")" term of an A.P.the sum of whose "n" terms is "S_(n)" .is "],[[" (a) "S_(n)+S_(n-1)," (b) "S_(n)-S_(n-1)],[" If the first term of the A.P.is "2" and common difference is "4," then the sum of its "40" is "]]

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