document.write( "Question 980120: Find the sum of all positive even integers from 1-100
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Algebra.Com's Answer #601332 by MathLover1(20849)\"\" \"About 
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\n" ); document.write( "if an even number is \"N\", then we have\r
\n" ); document.write( "\n" ); document.write( "\"N+=+%28First_+Even+%2B+Last+_Even%29%2F2+-+1\"\r
\n" ); document.write( "\n" ); document.write( "\"N+=+%282%2B100%29%2F2+-+1+=+50\"; so, there is \"50\" even numbers from \"1\" to \"100\"\r
\n" ); document.write( "\n" ); document.write( "\"Sum+=+%28number_+of_+integers%29+%2A+%28average_+of_+biggest_+and_+smallest%29\"\r
\n" ); document.write( "\n" ); document.write( "biggest even number is \"100\", smallest is \"2\", so average of biggest and smallest even number is \"%28100%2B2%29%2F2=51\"\r
\n" ); document.write( "\n" ); document.write( "then, the sum of first \"50\" positive \"even\" integers is \"%2850%29%2851%29+=+2550+\"
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