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My friend: I sent you the the lecture notes.

I: I'm not sure if all (of?) the 3 topics are there.

Should I add the preposition 'of' in this sentence?

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  • I'd discard the unnecessary article as well - I'm not sure if all 3 topics are there.
    – FumbleFingers
    Oct 31, 2019 at 15:12

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No, both all and all of are correct (although usage of all of has been growing lately). However, in your particular example, I would remove the, so the phrase looks like this:

I'm not sure if all 3 topics are there.
OR
I'm not sure if all of the 3 topics are there.

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