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If digits can be repeated there are 256 possibilities, too many to list.

If digits can't be repeated : We have 4 numbers, 3,8,7 and 9 (The order doesn't matter.). Imagine we have each number marked on a separate card, and 4 places upon which to place them. Then there are 4 ways of choosing the place for the first card ; after which are 3 ways to place the second one; 2 ways to place the third one; and 1 place left for the last one.

So there are 4 x 3 x 2 x 1 ways altogether = 24 ways.

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