document.write( "Question 892724: The sum of the terms of a finite arithmetic series is 624.
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Algebra.Com's Answer #540757 by robertb(5830)\"\" \"About 
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By the given, \"S%5Bn%5D+=+%28n%2F2%29%2A%28a%5B1%5D+%2B+a%5Bn%5D%29=624\"\r
\n" ); document.write( "\n" ); document.write( "But it is also given that \"a%5B1%5D+%2B+a%5Bn%5D+=+48\"\r
\n" ); document.write( "\n" ); document.write( "==>\"+%28n%2F2%29%2A%2848%29=624\"
\n" ); document.write( "==> n = 26
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