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Q: What do you call a set with no elements?

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A SUBSET!!! e.g. ABCBCCCBBDD is a set. A subset would say all the 'D'. ABCBCCCBB (DD)

a set having no elements, or only zeros as elements.

Empty Set

Any set that has elements that are not in that set.

The cardinality of a set is the number of elements in the set.

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A SUBSET!!! e.g. ABCBCCCBBDD is a set. A subset would say all the 'D'. ABCBCCCBB (DD)

The answer depends on what "200" refers to. A null set has no elements, but then it is strange to call it 200!

Elements, possibly.

The objects within a number set can be caled as "Elements" or "members".

The union of A and B.

The intersection of sets A and B.

Count the number of elements in the set - call this number n. Add up all the numbers in the set - call this total t Then mean = t/n

The empty set is the one that contains nothing at all. The universal set contains everything. Those are oversimplified definitions, but provide a good place to start. When we talk about things in sets, we call the things contained in the sets elements. So we can be more precise and say the empty set is a unique set with no elements. The universal set contains all elements INCLUDING itself.

a set having no elements, or only zeros as elements.

If all the elements in set A are also elements of set B, then set A is a subset of set B.

If you mean null set, that's a set having no elements, or only zeros as elements.

A finite set or a countably infinite set.

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