State which of the following are null or empty sets?
$\{H o r s e s w h i c h h a v e 5 l e g s\}$

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Solution

A set that contains no member is called the empty set or null set. It is represented by $\{\}$ or $ϕ$ .
Given set: $\{H o r s e s w h i c h h a v e 5 l e g s\}$
As we know there cannot be any horse with $5$ legs. The given set will contain no member or element.
Hence, the set $\{H o r s e s w h i c h h a v e 5 l e g s\}$ is a null or empty set.

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