I think that sequences usually have about 5 of the series given if theyâ€™re straightforward and you have to find the next one. If there are many more than that then it is almost certain that it is two sets of sequences. In this case because there are 9 given you should see if skipping every alternate one works, which in this case it does.
So you end up with two sequences which go:
YZ BD EH HL KP
UP TJ SD RX ??
You can ignore the first of these two sequences altogether. Then hopefully in the second sequence, which is what youâ€™re trying to identify, it is more obvious that the first letter is -1 every time and the second letter is -6 (you should always look at the first and second letters separately).
So hopefully the answer you came up with is QR?
With my DS, whilst I'm keen to encourage him to answer every question as them come up (apart from the type Z, guess and come back to ones) I also want him to know when to give up.... Some advice from Patricia or other experienced users might be useful on this....