Suppose we have a partial sum formula for the sequence $a_n$ :
$ S_n = \sum_{k=1}^{n} a_k $.
Is there any way to derive sequence formula $ a_n $ directly from $S_n$?
Suppose we have a partial sum formula for the sequence $a_n$ :
$ S_n = \sum_{k=1}^{n} a_k $.
Is there any way to derive sequence formula $ a_n $ directly from $S_n$?
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