Math Problem Statement
Hỏi có tất cả bao nhiêu số tự nhiên không chứa chữ số 0 và chia hết cho 3 sao cho nó có 3 chữ số khác nhau ?
Solution
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Math Problem Analysis
Mathematical Concepts
Combinatorics
Number Theory
Formulas
Permutations (nPr)
Combinations (nCr)
Theorems
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Suitable Grade Level
High School
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