Question: Let A : = {k : k N; k < 20}; B : = {3k 1 : k N]; and C :

Let A : = {k : k ∊ N; k < 20}; B : = {3k  1 : k ∊ N]; and C : = {2k + 1 : k ∊ N}: Determine the sets:
(a) A ∩ B ∩ C,
(b) (A ∩ B) \ C,
(c) (A ∩ C) \ B.

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