Jane
The Hidden Trio is in R8 which reads:
- Code: Select all
347 367 34567 2569* 1 56 278 2589* 67
So you are looking for 3 numbers (say a, b, c) that only appear in 3 cells, and any other numbers that appear with these 3 numbers (a, b, c) can be deleted.
the 3 numbers do not have to appear in all three cells, although they do each appear at least twice.
Once you have found this you will spot a Naked Pair in a column, using one of the Hidden Trio/Triple cells, that will lead to a Naked Single.
If you need any more help post you candidate grid and we'll try and give you more hints.