The digits (5 4 3 2) can be arranged in (4 x 3 x 2 x 1) = 24 different sequences.
If they're allowed to repeat in the same sequence, then there are (4 x 4 x 4 x 4) = 256 possibilities.
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54.32
543.2
There are 6C3 = 20 such combinations.
There are 5C3 = 10 combinations.
There are 10,737,573 combinations and you must think I am mad if you think I am going to list them!