# Find the sum of all possible combinations?

**Number Theory**Level 2

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.