Which of the following are examples of the null set
$\{ x:x$ is a natural numbers, $x\, < \,5$ and $x\, > \,7\} $
Which of the following are examples of the null set
$\{ x:x$ is a natural numbers, $x\, < \,5$ and $x\, > \,7\} $
$\{ x:x$ is a natural numbers, $x\, < \,5$ and $x\, > \,7\} $ is a null set because a number cannot be simultaneously less than $5$ and greater than $7$
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