Math, asked by nitish98, 1 year ago

the number of natural numbers less than 1000 in which no two digits are repeated

Answers

Answered by sanjana329

12

Step-by-step explanation:

Total number of 1 digit number =9

The number of 2 digit non-repeated number =9×9

⇒81

The number of 3 digit non-repeated number =9×9P2

⇒9×9×8

⇒648

∴ Required number of ways =9+81+648

⇒738

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