NinetynineCounting numbers with distinct digits under conditions
CAT has tested this idea 5 times across 5 papers, from 2020 to 2024. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.
| Question | What it asks | Answer |
|---|---|---|
| CAT 2024 Slot 3 · QA Q14 near-repeat | numbers up to 500 with non-repeating digits | 378 |
| CAT 2023 Slot 1 · QA Q21 near-repeat | numbers up to 1000 with non-repeating digits | D |
| CAT 2020 Slot 3 · QA Q16 | three-digit numbers with at least one repeated digit | 252 |
| CAT 2022 Slot 2 · QA Q12 | integers above 2000 from digits 0 to 5 | A |
| CAT 2020 Slot 2 · QA Q26 | four-digit distinct digits with 7 before 3 | 315 |
Part of Permutations & Probability (21 questions since 2017).