Permutation and Combination

This topic covers concepts, such as Permutations and Combinations, Fundamental Principles of Counting (FPC), Addition Principle, and Multiplication Principle.

This topic covers concepts, such as Permutation, Factorial, Exponent of Prime Number p in n Factorial, Permutation of Distinct Objects, Permutation of n Distinct Objects Taken All at a Time, Permutation of n Distinct Objects Taken r at a Time, etc.

This topic covers concepts, such as Circular Permutation, Circular Permutation of 'n' Distinct Objects Taken All, Circular Permutation when Clockwise and Anti-Clockwise Permutations are Same, etc.

This topic covers concepts, such as Combination, Difference between Permutation and Combination, Selection of 'r' Objects out of 'n' Distinct Objects, Selection of 'r' Objects out of 'm+n+p' Objects where 'm' Alike, 'n' Alike and 'p' Distinct, etc.

This topic covers concepts, such as Inclusion-Exclusion Principle in Combinatorics and Arrangement and Derangement in Permutation.

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, Product of Divisors, Division into Groups in Combinations, etc.