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The $n^{t h}$ term of an A.P., the sum of whose n terms is $S_{n}$ , is

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S_{n} + S_{n - 1}

S_{n} - S_{n - 1}

S_{n} + S_{n + 1}

S_{n} - S_{n + 1}

answer is B.

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a_{n} = S_{n} - S_{n - 1}

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