ten factorial = 10! = 3,628,800
27 three digit numbers from the digits 3, 5, 7 including repetitions.
There are 5*4*3 = 60 such numbers.
24
24
9999
100,000
12
512
24
There are 504 such numbers.
There are 60480 numbers.
840
823543
6
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.