Determine the number of natural number smaller than 104, in the decimal notation of which all the digits are distinct
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Step-by-step explanation:
It means that that you must find all numbers in the range 1≤n<104 without duplicate digits in their decimal notation. In some schools the range of "natural number" is 0≤n<104.
1234
is allowed but not
1134
because it contains a repetition.
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