X {n ∈ N : 10 ≤ n < 20}. Find examples of sets with the properties below and very briefly explain why your examples work. (a) A set A ⊆ N with |A| 10 such that X \ A {10, 12, 14}. (b) A set B ∈ P(X) with |B| 5. (c) A set C ⊆ P(X) with |C| 5. (d) A set D ⊆ X × X with |D| 5

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