Five numbers (5, 6, 7, 8, 9) can be selected for each of the 5 digits. So, there are 5*5*5*5*5 or 55 or 3125 five digit numbers.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
24
There are 5*4*3 = 60 such numbers.
It is possible to create a 3-digit number, without repeated digits so the probability is 1.
A lot. And there is akways the code. 1234
823543
81
There are 5! = 120 such numbers.
There are 7,290 different 4-digit numbers that can be formed from the digits 1-9 without repetition.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
27 if the digits can be repeated. 6 if not.
24
3x3x3=27
500
There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.
There are 5*4*3 = 60 such numbers.
4*3*2*1 = 24