Find the sum of all possible combinations?

Given the four digits 1, 2, 3, and 4. If you generated every possible combination of the four digits, what would be the sum of all these combinations?

[For example, with the digits 1, 2 and 3; there are six combinations and the sum of these combinations is:

123 + 132 + 213 + 231 + 312 + 321 = 1332.

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