How to solve CAT 2023 Slot 1 - Quant Question 21?

This question can be solved by applying the core concept explained in the solution above, followed by step-by-step calculation and elimination of options.

Which concept is tested in this question?

This question tests fundamental concepts commonly asked in CAT exams.

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CAT 2023 - Slot 1 Quant Question 21

This is a detailed step-by-step solution for CAT 2023 - Slot 1 Quant Question 21. Understand the concept, common mistakes, and expert tips to solve similar questions in CAT exam.

CAT 2023 Slot 1 - Quant

Single digit nos. → 9
Two digit such no. = 9 × 9 = 81

Three digit such no. = 9 × 9 × 8 = 648
Total no. of natural nos. less than 1000 with no digit repeated = 9 + 81 + 648 = 738

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