document.write( "Question 879052: 720,?,120,30,6,1 \n" ); document.write( "
Algebra.Com's Answer #530473 by AnlytcPhil(1806)\"\" \"About 
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document.write( "720,?,120,30,6,1\r\n" );
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document.write( "Let's look at the reverse sequence.  In other words, let's \r\n" );
document.write( "start with the 1 and go backwards:\r\n" );
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document.write( "1,6,30,120,?,720\r\n" );
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document.write( "To get from 1 to 6, we multiply 1 by 6\r\n" );
document.write( "To get from 6 to 30, we multiply 6 by 5\r\n" );
document.write( "To get from 30 to 120, we multiply 30 by 4\r\n" );
document.write( "So following that pattern, we multiply 120 by 3, to get 360,\r\n" );
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document.write( "To see if it works all the way, we follow that pattern and \r\n" );
document.write( "multiply 360 by 2, and get 720.  So the pattern works.  The missing\r\n" );
document.write( "number is 360.\r\n" );
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document.write( "720,360,120,30,6,1\r\n" );
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document.write( "Edwin
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