Sagot :
Answer:
In set theory, a subset is a set which has some (or all) of the elements of another set, called superset, but does not have any elements that the superset does not have. A subset which does not have all the elements of its superset is called a proper subset. We use the symbol ⊆ to say a set is a subset of another set.
Step-by-step explanation:
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Answer:
Null set or empty set
Step-by-step explanation:
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