Solve Mix Combinations

If you have A-B-C and combinations for those 3 are AA,AB,BA,BB,BC,CB,CC. You have to mix those combinations, you have to repeat them. This way ex. : (1.AA 2.AA 3.AA) (1.AB 2.AA 3.AA) (1.AA 2.BA 3.CB) etc. How many combinations would be and which would be them?

 

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