用四个2和三个0能组成几个七位数,把它们从大到小排列起来

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  • 2222000,2220200,2220020,2220002,2202200,2202020,2202002,2200220,2200202,2200022,2022200,2022020,2022002,2020220,2020202,2020022,2002220,2002202,2002022,2000222.