Q1 a
A subset is a set whose elements are all members of another set. The symbol "⊆" means "is a subset of". The symbol "⊂" means "is a proper subset.
Example: the set {1, 2, 3, 4, 5}
A subset of this is {1, 2, 3}. Another subset is {3, 4} or even another is {1}, etc. But {1, 6} is not a subset, since it has an element (6) which is not in the parent set.
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subset of B
Step-by-step explanation:
The symbol "⊂" means "is a proper subset of". Since all of the members of set A are members of set D, A is a subset of D. Symbolically this is represented as A ⊆ D. ... Although A ⊆ B, since there are no members of set B that are NOT members of set A (A = B), A is NOT a proper subset of B.
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