4 x 3 x 2 = 24 of them
500
180 of them.
It is 120 if the digits cannot be repeated.
There are 34 = 81 numbers.
The numbers from 1000 to 9999 are all 4 digits, as are -1000 to -9999. Therefore there are 18,000 four-digit numbers in all.
720
There are 7,290 different 4-digit numbers that can be formed from the digits 1-9 without repetition.
865410
27 three digit numbers from the digits 3, 5, 7 including repetitions.
24
500
There are 60480 numbers.
840
There are 3024 of them.
180 of them.
There are 5*4*3 = 60 such numbers.
1 set