Chapters / Permutation and Combination

Class 11

Permutation and Combination

JEE Main previous-year questions from 2002 to 2025, arranged topic by topic — from the counting principles through to derangements and Beggar’s method.

What is inside

Counting and arrangement

Factorials, ⁿCᵣ and ⁿPᵣ
Fundamental counting principles
Number formation
Word formation, and words with alike letters
Rank of a word or number (lexicographic order)

Selection

Committee formation and team selection
Formation of groups
Total number of selections

Standard methods

Gap and string method
Circular permutation
Beggar’s method and integral solutions
Derangements

Applications

Divisibility problems
Geometry: points, lines and polygons
Sum of the numbers formed
Power of 2, 3 and 5 in a factorial

Assignments

JEE Main PYQ · topic-wise · the full set opens with a factorial, ⁿCᵣ and ⁿPᵣ warm-up and carries more questions in most topics

Core Set · 128 questions Full Set · 171 questions

← All chapters · Revision series · Digital notes