Just 6:
123 132 213
231 312 321
180 of them.
500
There are 34 = 81 numbers.
To form a five-digit number using the digits 1, 2, 3, 4, and 5, each digit must be used exactly once. Since there are 5 unique digits, the total number of different five-digit numbers that can be formed is given by the factorial of the number of digits, which is 5! = 120. Therefore, 120 different five-digit numbers can be formed using the digits 12345.
27
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
180 of them.
There are 3024 of them.
840
There are 60480 numbers.
24
500
27 three digit numbers from the digits 3, 5, 7 including repetitions.
1 set
There are 5! = 120 such numbers.
There are 34 = 81 numbers.
6!