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CBSE Class 10 Answered

If the sum of n terms of an AP be 3n square +n and its common difference is 6, then find its first term.
Asked by snehamapink | 13 Feb, 2012, 04:35: PM
answered-by-expert Expert Answer
S1 = 3(1)2 + (1) = 4
So, first term is 4
S2  = 3(2)2 + 2 = 14
Second term is S2 - S1 = 14 - 4 = 10
Answered by | 13 Feb, 2012, 11:04: PM

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