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.
012345 or -543210, if negative numbers are permitted.
Possible 5 digit combinations using 5 digits only 1 time is 5! or 5*4*3*2*1 or 120. Using 5 digits where numbers can be used 5 times is 55 or 3125.
10,000
256
95
45
99999
It is possible to create infinitely many numbers, of infinitely many different lengths, using the digits of the given number. Using each of the digits, and only once, there are 5! = 120 different permutations.
depends on your answer
There are 60480 numbers.
Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
There are 4^6 = 4096 such numbers.
There are 3,265,920 numbers that can be formed using all the digits. The answer to the question will depend on which one of these.
If the digits are all different then 18. Otherwise, 192.
There are 192.
89,999 different numbers i guess