How many 4 - digit numbers are there ?

How many 7- digit numbers are there?

How many 6-digit numbers are there?

How many 7-digit numbers are there?

(i) How many three - digit numbers are there, with no digit repeated ? (ii) How many four - digit numbers are there, with no digit repeated ? (iii) How many natural numbers from 1 to 1000 have none of their digits repeated ?

How many three digit numbers are there with no digit repeated?

How many three digit numbers are there with no digit repeated?

How many four digit numbers are there with distinct digits?

How many four digit numbers are there with distinct digits?

How many 3-digit numbers are there with no digit repeated?