If the digits may not be repeated, there are 6x5x4x3x2x1 = 720 numbers,
If digits can be repeated, the answer is 6x6x6x6x6x6 = 46,656 numbers
If zero is ong the available digits but is excluded from the first place. 5x6x6x6x6x6=38,880 numbers
There are 729 unique possibilities. This is 3 to the power 6. For each of the positions in the 6 digit result, the selected digit will be one of the three possibilities.
180 of them.
500
There are 34 = 81 numbers.
27
pizza
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
There are 3024 of them.
180 of them.
There are 60480 numbers.
840
24
500
27 three digit numbers from the digits 3, 5, 7 including repetitions.
There are 5*4*3 = 60 such numbers.
1 set
There are 5! = 120 such numbers.
The number 1234567890 can create about 39 of 40 4 digit numbers.