Mathlover
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 Feb 21 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 21 characters in body Feb 21 comment How many different numbers can be written if each used digit symbol is used at least 2 times? Thanks a lot for answer . I edited my question with wonderful discover for $P(n,d)$. Could you please share your comments on my last edit? Feb 21 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 2166 characters in body Feb 19 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 1 character in body Feb 19 revised How many different numbers can be written if each used digit symbol is used at least 2 times? edited body Feb 19 revised How many different numbers can be written if each used digit symbol is used at least 2 times? edited body Feb 19 asked How many different numbers can be written if each used digit symbol is used at least 2 times? Jan 15 comment What is lower limit condition of a surface of a tetrahedron? Can we have only one lower condition ? or impossible. If it exists, it should be cyclic .for example, the lower condition could be \$|S_2-S_3|+|S_3-S_4|+|S_2-S_4|