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The sum of n terms of an AP is 3n^2+nand...

The sum of n terms of an AP is `3n^2+n`and its common difference is 6,then find its first term.

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
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  13. Let Sn denotes the sum of the first of n terms of A.P. and S(2n)=3Sn ...

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