Permutations and Combinations

Permutations and combinations explained with key formulas, counting principles, and simple examples for solving arrangement and selection problems.

1.Fundamental Principle of Counting
Fundamental principle of counting explained with AND and OR rules, clear definitions, and easy examples.
2.Factorial and Its Properties
Factorial meaning, special cases, properties and simplification rules explained with clear notes and examples.
3.Permutations
Meaning of permutations, formulas for nPr, repeated items, circular arrangements, and common arrangement examples explained clearly.
4.Combinations
Meaning of combinations, nCr formula, properties, and common selection examples explained clearly.
5.Applications of Permutations and Combinations
Common applications of permutations and combinations in word arrangements, digit-based numbers, seating, team selection, and basic probability.