document.write( "Question 1078797: n! * (n+2)! = (2n)!
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Algebra.Com's Answer #693230 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "It can't be a very large number since the right side\r\n" );
document.write( "would be tremendously larger than the right side if n\r\n" );
document.write( "were large.  So let's try n=1\r\n" );
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document.write( "1! * (1+2)! = (2∙1)!\r\n" );
document.write( "1 * 3! = (2)!\r\n" );
document.write( "1 * 6 = 2\r\n" );
document.write( "6 = 2\r\n" );
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document.write( "No, that's false. So let's try n=2\r\n" );
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document.write( "2! * (2+2)! = (2∙2)!\r\n" );
document.write( "2 * 4! = 4!\r\n" );
document.write( "2 * 24 = 24\r\n" );
document.write( "48 = 24\r\n" );
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document.write( "No, that's false. So let's try n=3\r\n" );
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document.write( "3! * (3+2)! = (2∙3)!\r\n" );
document.write( "6 * 5! = 6!\r\n" );
document.write( "6 * 120 = 720\r\n" );
document.write( "720 = 720\r\n" );
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document.write( "Yes, that's true!  So n=3.\r\n" );
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document.write( "Edwin

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