Question

define empty set or null set​

Answer 1

The empty set is the unique set having no elements; its size or cardinality is zero.

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Answer 2

$\huge\red{Answer}$

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☆☞ [ Verified answer ]☜☆

A null set is a set that is negligible in some sense.

The empty set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero.

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