Combinatorics · Permutations with repetition · Digit sums · Place value
Find the sum of all seven-digit numbers whose digits are \(1, 2, 3, 3, 4, 4, 4\) in some order.
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Serbian Regional Competition (Okruzno takmicenje) 2000, high school grade I, category A, problem 4. Organized by the Mathematical Society of Serbia (DMS). Source