JEE Maths
JEEMathsPermutations & CombinationsClass 11

What is the difference between with repetition and without repetition?

With repetition, items can be reused (like digits in a PIN); without repetition, each item is used at most once (like ranking people).

With repetition, items can be reused (like digits in a PIN); without repetition, each item is used at most once (like ranking people). A reliable way to keep them apart is to focus on what each one is defined by, not just the similar-sounding words.

Key point

with repetition vs without repetition

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