CAT 2024 Permutations and Combinations Question (Medium)

Question

What is the number of all positive integers less than or equal to 500 that have non-repeating digits?

Optima Learn · Accepted Answer

Numbers of different lengths obey different constraints, so the range splits by digit count and the three counts add. Understanding the Context. Non-repeating digits means no digit appears twice in the same number. The range runs from 1 to 500 inclusive, which covers every one-digit and two-digit nu

CAT 2024 Permutations and Combinations — Previous Year Question

CAT 2024

Quantitative

Permutations and Combinations

Medium

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