Which of the following pairs of sets are disjoint 

$\{ x:x$ is an even integer $\} $ and $\{ x:x$ is an odd integer $\} $

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$\{ x:x$ is an even integer $\}  \cap \{ x:x{\rm{ }}$ is an oddinteger $\}=\varnothing$

Therefore, this pair of sets is disjoint.

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