What does “Permutation” actually mean in Permutations & Combinations, and why does it matter for JEE?
an arrangement where order matters: nPr = n!/(n−r)!.
In simple words: an arrangement where order matters: nPr = n!/(n−r)!. Getting Permutation clear matters because JEE questions on Permutations & Combinations usually test this idea directly, not just a formula you memorised.
Key point
Permutation
Common mistake
using permutations when order doesn't matter.
Memory tip
if rearranging counts as different, it's a permutation.
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