1.

The sum of the first n terms of the series 12+34+78+1516+..... is [IIT 1988; MP PET 1996; RPET 1996, 2000; Pb. CET 1994; DCE 1995, 96]

Answer» The sum of the first n terms of the series 12+34+78+1516+..... is
[IIT 1988; MP PET 1996;
RPET 1996, 2000; Pb. CET 1994; DCE 1995, 96]


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