There are 840 4-digit combinations without repeating any digit in the combinations.
-24686
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
There are 60480 numbers.
125
8 of them.
52C6=(52!)/(6!*(52-6)!)=20,358,520
a lot
-24686
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
2
There are 60480 numbers.
210
How many numbers are there between 0000 and 9999?
six
ten factorial = 10! = 3,628,800
179 of them.
125