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N:{1, 2, 3 ,4 ,5 , 6 , 7 ... 20}
C:{Numbers divisible by three}
~N{3, 6, 9, 12, 15, 18}

yes, the subset is correct, but why the notation ~N ?

You an use: N' or ~N

wouldn't N' or N~ be the complement of N ?
use another name for subset, say M

I don't understand? "wouldn't N' or N~ be the complement of N ?"
Isn't it a complement?

Can you explain the difference, please?

Okay, so ~B means elements in A that are not in B
Subset is elements in B that are in A.

so in your example, in subset c, you are just taking elements of N which are divisible by 3

Roger that.

ask if any more doubts ?

I'm good. I'll be sure to message you in the future if I have any questions or concerns.

good :) or feel free to tag me in your question

Ok.