Its a lot easier if you have the 3 digits in separate columns such as col A, col B, Col C
so if you had cell A1 value 7, cell B1 value 2, cell c1 value 9
in cell E1 formula is =A1&B1
in cell F1 formula is =A1&C1
in cell G1 formula is =B1&A1
in cell H1 formula is =B1&C1
in cell I1 formula is =C1&A1
in cell J1 formula is =C1&B1
should give you :
Note it still works with zero values e.g 068 becomes
If you have your 3 digits in a single cell (or column) then considerably more manipulation is needed to split them up, and the cells would need to be formatted to display any leading zeroes..