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The n t h term of an A.P., the sum of ...

The `n t h` term of an A.P., the sum of whose `n` terms is `S_n` , is `(a) S_n+S_(n-1)` (b) `S_n-S_(n-1)` (c) `S_n+S_(n+1)` (d) `S_n-S_(n+1)`

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