Grades 11-12 Video Solutions 2011-11&12 Video Solutions 2011 problem5

11&12 Video Solutions 2011 problem5

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The number 2011 is positioned 9th when all four-digit positive numbers, whose digit sum equals four, are arranged in decreasing order. The sequence is: 4,000; 3,100; 3,010; 3,001; 2,200; 2,110; 2,101; 2,022; and 2,011.