5! = 5 x 4 x 3 x 2 x 1 = 120
If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.
999-111=888 888 3 digit numbers can be made with numbers between 1 - 9
Just think of how many possibilities you have for each digit. 10x9x8x7x6x5x4x3x2 or 10 factorial is 3 628 800.
120
It would be from 1111111 to 9999999, and because 9999999 - 1111111 = 8888888, the answer is 8888888.
a lot
2
210
5040 numbers can be made.
You can make 4*3*2/2 = 12 numbers.
9
321 312 213 231 123 132 6 3 digit numbers.
If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.
-- If the same digit may be repeated, then 64 can be made. -- If the same digit may not be repeated, then 24 can be made.
120 5-digit numbers can be made with the numbers 12345.
15
10,000