document.write( "Question 1190792: Find the sum of positive integers between 100 and 999 inclusive which are odd. \n" ); document.write( "
Algebra.Com's Answer #822547 by ikleyn(52794)\"\" \"About 
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\n" ); document.write( "Find the sum of positive integers between 100 and 999 inclusive which are odd.
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document.write( "First term is 101.  The last term is 999.\r\n" );
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document.write( "Their average is  \"%28101%2B999%29%2F2\" = \"1100%2F2\" = 550.\r\n" );
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document.write( "The number of terms is  \"%28999-101%29%2F2%2B1\" = \"898%2F2%2B1\" = 450.\r\n" );
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document.write( "The sum is  S = \"%28%28a%5B1%5D%2Ba%5Bn%5D%29%2F2%29%2An\" = 550*450 = 247500.    ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "For introductory lessons on arithmetic progressions see \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
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "Also,  you have this free of charge online textbook in ALGEBRA-II in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Arithmetic progressions\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-II
\n" ); document.write( "https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "into your archive and use when it is needed.\r
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