NCERT Maths - Class 11 Chapter 6: Permutations and Combinations

Always together: group as one block, multiply by internal permutations.
Never together: total − always-together.
No two alike adjacent: arrange distinct first, then slot others in gaps.
Alternating arrangement: fix one class, slot the other. Positions matter!
Between-position: fix positions of P,S; permute the rest.

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Permutations and Combinations

Master the art of counting - arrangements, selections, and JEE-style combinatorics!

Lessons

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Class 11 · Chapter 6 · NCERT aligned

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