The \( n^{\text {th }} \) term of an A.P., the sum of whose \( n \) terms is \( S_{n} \), is (W)...

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The \( n^{\text {th }} \) term of an A.P., the sum of whose \( n \) terms is \( S_{n} \), is
(W)
(a) \( S_{n}+S_{n-1} \)
(b) \( S_{n}-S_{n-1} \)
(c) \( S_{n}+S_{r+1} \)
(d) \( S_{n}-S_{n+1} \)
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