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The sum of the first n terms of an A.P. is 3n + n^2.  Find the first term and the sum of the first two terms. 

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The sum of the first n terms of an A.P. is 3n + n2. 

Find the first term and the sum of the first two terms.

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\(\therefore\) The first term is 4 and the sum of the first two terms is 10.

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