Find the sum of 1.2+3.4+5.6+7.8+..................................................................
sudhanshu Tripathi , 7 Years ago
Grade 12th pass
Algebra> Find the sum of 1.2+3.4+5.6+7.8+............
1 AnswersShailendra Kumar Sharma
Last Activity: 7 Years ago
Tr= (2r-1)(2r+2)
Tr = 4r2 +4r-2r-2
Tr= 4r2+2r-2
So Sn =
Sn= 4{n(n+1)(2n+1)/6} +2 {n(n+1)}/2 -2n
=2/3{n(n+1)(2n+1)+ n(n+1)-2n
Tr = 4r2 +4r-2r-2
Tr= 4r2+2r-2
So Sn =
Sn= 4{n(n+1)(2n+1)/6} +2 {n(n+1)}/2 -2n
=2/3{n(n+1)(2n+1)+ n(n+1)-2n
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