In case of digits or numbers, when we say combination, since the order of the numbers matters, we really need to find the permutations. For example, 12 and 21 are two permutations and not...
You are using "combination" which means that there are really only 5 ways to combine those numbers since in combination, order is not important.
Your question seems to indicate that you want to know...
If no digit can be repeated then there are 5 combinations, abcd, abce, abde, acde and bcde.If you regard abdc as different from abcd then each of the 5 basic sets could be arranged 24 ways and the...