document.write( "Question 1056567: Use any suitable method to find the sum of
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Algebra.Com's Answer #671653 by ikleyn(52795)\"\" \"About 
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\n" ); document.write( "Use any suitable method to find the sum of
\n" ); document.write( "63+68+73+...+103+108
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\n" ); document.write( "\n" ); document.write( "Arithmetic progression with the common difference 5.\r
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\n" ); document.write( "\n" ); document.write( "The number of terms is \"%28108-63%29%2F5\" + 1 = 10.\r
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\n" ); document.write( "\n" ); document.write( "The sum is \"%28%2863%2B108%29%2F2%29%2A10\" = 855.\r
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\n" ); document.write( "\n" ); document.write( "I used the formula for the sum of an arithmetic progression.\r
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\n" ); document.write( "\n" ); document.write( "See the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Arithmetic progressions\r
\n" ); document.write( "\n" ); document.write( "    - The proofs of the formulas for arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "    - Problems on arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "    - Word problems on arithmetic progressions\r
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