fifty
* * * * *
What sort of rubbish answer is that?
There are 10C5 = 10*9*8*7*6/(5*4*3*2*1) = 252 combinations.
24
There are a huge number of combinations of 5 numbers when using the numbers 0 through 10. There are 10 to the 5th power combinations of these numbers.
106,601,160,610
If the numbers can be repeated and the numbers are 0-9 then there are 1000 different combinations.
There are 45 combinations.
9
Including the leading zero, then the answer is 210. Or, allowing for repeating numbers, 10000.
There are 9C3 = 84 combinations.
If every number can be used as many times as you like, there are 104 = 10000 different combinations. If each number can only be used once, there are 9!/(9 - 4)! = 5040 combinations.
∞ \ Infinite
9000
9