Permutations and combinations

1

Introduction to Combinatorics & Counting Principles

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2

Factorial Notation & Simple Arrangements

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3

Permutations ($^nP_r$)

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4

Permutations with Restrictions

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5

Circular Permutations

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6

Combinations — $^nC_r$

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7

Properties of Combinations & Pascal's Identity

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8

Principle of Inclusion–Exclusion

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9

The Pigeonhole Principle

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10

Combinatorial Identities & Proofs

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11

Mixed Combinatorics & Exam Technique

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