document.write( "Question 1011842: 2+4+6+.....2n=n(n+1) \n" ); document.write( "

Algebra.Com's Answer #627626 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "2+4+6+.....2n = 2*(1 + 2 + 3 + . . . + n) = $\"2%2A%28%28n%2A%28n%2B1%29%29%2F2%29\"$ = n*(n+1).\r
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\n" ); document.write( "\n" ); document.write( "By the way, were there no a question in your post.\r
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