graph TB
A[Derivation of number of derangements of an n-set]
A --> B[Definition of Derangement]
A --> C[Derangement Formula]
B --> D[Derangement of a Single Element]
B --> E[Derangement of Multiple Elements]
C --> F[Derivation of Derangement Formula]
F --> G[Using Inclusion-Exclusion Principle]
F --> H[Using Recurrence Relation]
G --> I[Explanation of Inclusion-Exclusion Principle]
H --> J[Explanation of Recurrence Relation]

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