103 and 301 .
"130" and "310" .
18 of them.
24 different numbers.
If they can be repeated, 343 different numbers. If they can be used once each, there are only 210.
9630
"130" and "310" .
18 of them.
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
24 different numbers.
If they can be repeated, 343 different numbers. If they can be used once each, there are only 210.
9630
256
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
120 There are 6 digits in total. The numbers with 3 digits, with all digits distinct from each other, are the permutations of the 6 digits taken 3 at a time, and therefore there are 6*5*4 = 120 of them.
The difference is 360.
3
Well honey, you've got 4 digits there, so you can form 4! (4 factorial) which is 24 numbers. That's right, you can make 24 different combinations with those digits. Math can be fun when you've got some sassy numbers to play with!