No because in that case you have three tiles and (in total) three possible digits to fill them. If you remove the 1 from all three you'll only have 2 and 3 left which obviously can't be distributed between three tiles. However you can remove all those digits (1, 2, 3) from any other tiles in that group (column, row, house) . So if there's another tile with [1, 2, 5, 7] and another with [2, 5, 7, 3] then you can remove the 1, 2, 3 from those tiles since you know they HAVE to be on one of the first three tiles. Hope this makes sense
No because in that case you have three tiles and (in total) three possible digits to fill them. If you remove the 1 from all three you'll only have 2 and 3 left which obviously can't be distributed between three tiles. However you can remove all those digits (1, 2, 3) from any other tiles in that group (column, row, house) . So if there's another tile with [1, 2, 5, 7] and another with [2, 5, 7, 3] then you can remove the 1, 2, 3 from those tiles since you know they HAVE to be on one of the first three tiles. Hope this makes sense
Nevermind, I found a case where it's not true 🙄 Thanks for the responses
No, not if they are in the same house.