document.write( "Question 1056567: Use any suitable method to find the sum of
\n" ); document.write( "63+68+73+...+103+108
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Algebra.Com's Answer #671683 by MathTherapy(10552)\"\" \"About 
You can put this solution on YOUR website!
Use any suitable method to find the sum of
\n" ); document.write( "63+68+73+...+103+108
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Number of terms (n) in the sequence: \"n+=+%28a%5Bn%5D+-+a%5B1%5D%29%2Fd+%2B+1\", where:\r\n" );
document.write( "\"a%5Bn%5D\" is the last term\r\n" );
document.write( "\"a%5B1%5D\" is the 1st term\r\n" );
document.write( "d is the common difference

\n" ); document.write( "\"n+=+%28a%5Bn%5D+-+a%5B1%5D%29%2Fd+%2B+1\" now becomes: \"n+=+%28108+-+63%29%2F5+%2B+1\"_____\"n+=+%2845%2F5+%2B+1%29\"
\n" ); document.write( "n, or number of terms = 9 + 1, or 10\r
\n" ); document.write( "\n" ); document.write( "Sum of an AP formula: \"S%5Bn%5D+=+%28n%28a%5B1%5D+%2B+a%5Bn%5D%29%29%2F2\"
\n" ); document.write( "\"S%5B10%5D+=+%2810%28108+%2B+63%29%29%2F2\"____\"S%5B10%5D+=+5%28171%29\"
\n" ); document.write( "Sum of the AP, or \"highlight_green%28matrix%281%2C3%2C+S%5B10%5D%2C+%22=%22%2C+855%29%29\" \n" ); document.write( "
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