State which of the following are null or empty sets?
$\{D a y s w i t h 1440 m i n u t e s\}$

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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:
$\{D a y s w i t h 1440 m i n u t e s\}$
As we know in a day there is $24 h o u r s$ .
$24 h o u r s = 24 \times 60 m i n u t e s = 1440 m i n u t e s$ ( $1 h o u r = 60 m i n u t e s$ )
Each day has $1440 m i n u t e s$ .
Hence, the set $\{D a y s w i t h 1440 m i n u t e s\}$ is not a null or empty set.

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