The common difference of an A.P., the sum of whose \( n \) terms is \( S_{n} \), is (a) \( S_{n}...

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The common difference of an A.P., the sum of whose \( n \) terms is \( S_{n} \), is
(a) \( S_{n}-2 S_{n-1}+S_{n-2} \).
(b) \( S_{n}-2 S_{i t-1}-S_{i-2} \)
(c) \( S_{n}=S_{n-2} \)
(d) \( \mathfrak{\$}_{n}-\mathfrak{\$}_{n-1} \)
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