document.write( "Question 296839: \n" ); document.write( "

Algebra.Com's Answer #213833 by jrfrun(3) $\"\"$ $\"About$

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The sum of the first 400 even numbers = 2*(sum of the first 200 numbers)
\n" ); document.write( "ie 2+4+6+ ....+ 400 = 2(1+2+3+4+...+200) = 2*200*201/2=200*201=40200 \n" ); document.write( "

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