Math Problem Statement
. Tìm số hoán vị (a1,a2,a3,a4,a5) của tập {1,2,3,4,5} thỏa mãn rằng (a1,...,ai) không phải là hoán vị của {1,2,...,i}
Solution
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Math Problem Analysis
Mathematical Concepts
Combinatorics
Derangements
Formulas
Formula for derangements D_n = n! \left( \sum_{k=0}^{n} \frac{(-1)^k}{k!} \right)
Theorems
Principle of inclusion-exclusion
Suitable Grade Level
Advanced High School or College
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