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 Apr 12 revised Understanding Leibniz formula: $D^n (f g) = \sum\limits_{k=0}^{n} \binom{n}{k} D^{n-k}f D^kg$ deleted 3 characters in body Feb 25 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 39 characters in body Feb 25 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 32 characters in body Feb 25 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 631 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 23 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 38 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 57 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 800 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 13 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? deleted 2716 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 124 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 124 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 124 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 124 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 124 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? edited body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 611 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? edited tags Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 51 characters in body Feb 23 revised How many different numbers can be written if each used digit symbol is used at least 2 times? added 10 characters in body