document.write( "Question 1073858: Sum of first 2n natural number is n(2n+1)\r
\n" ); document.write( "\n" ); document.write( "Mean of first 2n natural number is n(2n+1)/2n=n(2n+)/2\r
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Algebra.Com's Answer #688682 by ikleyn(52787)\"\" \"About 
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