document.write( "Question 1040978: a conference hall has 20 rows of seats .the first row contains 20 seats,the second row contains 22 seats,
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Algebra.Com's Answer #655965 by ikleyn(52788) $\"\"$ $\"About$

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document.write( "Arithmetic progression with the first term 20 and the common difference 2.\r\n" );
document.write( "They ask you to find the sum of the first 20 terms.\r\n" );
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document.write( "Similar problem was solved in the lesson Word problems on arithmetic progressions in this site (Problem 4).\r\n" );
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document.write( "Read it and use it as your sample.\r\n" );
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document.write( "For arithmetic progressions read this lesson Arithmetic progressions in this site.\r\n" );
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