20 of them, if repetition is not allowed.
120 5-digit numbers can be made with the numbers 12345.
It is: 9C7 = 36
66
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
There are 4 possible numbers if the digits are not repeated; 18 if they are. Those are 3-digit numbers, assuming that zero would not be a leading digit. If zero is allowed for a leading digit, then you can have 6 for the non repeated, and 27 if repetition.
a lot
2
210
5040 numbers can be made.
9
You can make 4*3*2/2 = 12 numbers.
321 312 213 231 123 132 6 3 digit numbers.
If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.
-- If the same digit may be repeated, then 64 can be made. -- If the same digit may not be repeated, then 24 can be made.
120 5-digit numbers can be made with the numbers 12345.
It is: 9C7 = 36
66