Question

what do you do in a set of numbers they don't have the same number of digits then assuming all the numbers are positive and whole give explanation with example​

Answer 1

Answer:

You have 8 choices for the third digit (digits 0 - 9 excluding the numbers you chose for the first and second digit). So by the multiplication principle (MP), there are 9*9*8 ways to do this. So there are 648 numbers that are 3 digit numbers and have no repeated digits.