‘the easier’ or ‘easier’

AnonymousIs ‘the’ necessary before ‘easier’ in the sentence belo

If you are referring to two specific books—and you must be—then yes, Koji.

Thank you very much again, Mister Micawber.

Now I have an additional question.
In a sentence like (a), I don’t think you use ‘the newer’ but ‘newer’, even though you are comparing two things.

(a) Which is (the) newer, this one or that one?

Then can I say like this?
If two things or people are already mentioned or suggested, you use ‘the+comparative’. If not , you simply use ‘comparative.’

Is this right? If

Hi Koji,

We need to start again, sorry. It is my mistake. In your first post, I was thinking about 'the' before 'books', not before 'easier'.

Your original question:

Is ‘the’ necessary before ‘easier’ in the sentence below? Which of the two books is the easier for beginners?

My answer should have been 'No—in fact, the omitted 'the' is the usual.'

Thank you very much. I understand. I don’t have any more question now.