Question 1169395
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The statement of the problem is deficient.<br>
While it is very often the case that the use of "Sn" when talking about an arithmetic sequence indicates the <b><i>SUM</b></i> of the first n terms, it is not a universally accepted convention.<br>
The statement of the problem should either use the words "sum of n terms", or it should specify that the notation Sn represents the sum of n terms and not the nth term.<br>