Combinatorics

This topic covers concepts such as Permutations and Combinations, Fundamental Principles of Counting (FPC), Addition Principle, Multiplication Principle, Factorial, Exponent of Prime Number p in n Factorial, and Properties of Factorial Notation.

This topic covers concepts such as Permutation, Permutation of Distinct Objects, Permutation of n Distinct Objects Taken All at a Time, Permutation of n Distinct Objects Taken r at a Time, Understanding of nPr and its Existence, etc.

This topic covers concepts such as Combination, Combinatorics Problems on Polygon, Difference between Permutation and Combination, Selection of 'r' Objects out of 'n' Distinct Objects, Understanding of nCr and its Existence, etc.

This topic covers the concept of Inclusion - Exclusion Principle in Combinatorics.

This topic covers concepts such as Pigeonhole Principle and Applications of Pigeonhole Principle.

This topic covers concepts such as Bijection Principle and Applications of Bijection Principle.

This topic covers concepts such as Divisors of an Integer, Number of Divisors of a Number N, Odd and Even Divisors of a Number N, Divisors in the Form of 4N, 4N+1, 4N+2 and 4N+3, Sum of Divisors of a Number N, Product of Divisors, etc.

This topic covers the concept of Arrangement and Derangement in Permutation.