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| 1. |
What is sum of n terms of the series 1.2.3+2.3.4+3.4.5+............. Upto n terms ? |
| Answer» l=n(n+1)(n+2)Sum=n^3+3n^2+3n=[n+1/2]^2+3*n(n+1)(2n+1)/6+3*n(n+1)/2 Then take common and solve it | |