Determine the sum of all the numbers that can be formed with digits 1,2 and 3, each occurring only once in a number

6 answers

possible numbers:
single digits:
1
2
3

double digits
12
13
23
21
31
32

triple digits:
123
132
213
231
312
321

Can you add them up ?
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I can't understand bro
1407
Here is the answer.

1470
1470 is the answer.