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Assume that the four numbers are unique; so [4 + 4 + 1 + 1] is not one of the answers. Also assume that zero is not one of the digits which are used. With those constraints, there is only one, which is 1 + 2 + 3 + 4 = 10.
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10
There are 13 combinations.
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Assuming you mean digits and not didgets, the answer is 6.