100,000
24
There are 504 such numbers.
823543
6
9999
100,000
512
24
There are 504 such numbers.
There are 60480 numbers.
823543
6
840
There are 7,290 different 4-digit numbers that can be formed from the digits 1-9 without repetition.
There are 5! = 120 such numbers.
The number 1234567890 can create about 39 of 40 4 digit numbers.