Question

How many of the natural numbers from 1 to 1000 have none of their digit repeated?​

Answer 1

Answer:

The only 4-digit number in the range [1,1000] is 1000, but it has '0' repeated thrice. So, no 4-d-g-t number possible.

Answer 2

Answer:

1000 no.

becoz all of natura no.