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CBSE Class 11-science Answered

Find the sum of n terms of the following series 3.8+6.11+9.14+............?
Asked by | 06 Jul, 2008, 11:49: PM
answered-by-expert Expert Answer

3.8+6.11+9.14+....

nth term of this series is Tn=3n(3n+5) = 9n2+15n

thus, sum of n terms of this series is

  Tn = 9n2+15n

          =

Answered by | 14 Jul, 2008, 03:50: PM
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