Palak Sir is very good in Math. He solves all the problems in the book and clears all the doubts on spot. He also gives tips and tricks on how to solve complex problems.
Top Concept Videos in Mathematics Permutations and Combinations
Fundamental Principle Governing All Counting
CBSE - Class 11>Mathematics>Permutations and Combinations
Permutations Combinations Arrangements Made Easy
CBSE - Class 11>Mathematics>Permutations and Combinations