What does “Combination” actually mean in Permutations & Combinations, and why does it matter for JEE?
a selection where order does not matter: nCr = n!/[r!(n−r)!].
In simple words: a selection where order does not matter: nCr = n!/[r!(n−r)!]. Getting Combination clear matters because JEE questions on Permutations & Combinations usually test this idea directly, not just a formula you memorised.
Key point
Combination
Common mistake
using combinations when order actually matters.
Memory tip
if only the group matters (not its order), it's a combination.
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