I think that there are two choices:
1. B - because you have 1,5,9 as a possibility.
2. R - because you have 3,6,9 as a possibility.
BTW thanks for the interesting posts.
1. B - because you have 1,5,9 as a possibility.
2. R - because you have 3,6,9 as a possibility.
BTW thanks for the interesting posts.