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2621.1. Variation, combination

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Let's look at all three-digit numbers, in which notation are used numbers 1; 2; 3 and 0. How many such numbers are together?
How many such numbers are together, if the digits can not repeat?
How many three-digit numbers there are, in which notation used digits and the sum of digits does not exceed 7 (if the digits does not repeat)?
Combinatorics, probability theory elements
Variation, combination

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