Which of the following pairs of sets are disjoint 

$\{1,2,3,4\}$ and $\{ x:x$ is a natural number and $4\, \le \,x\, \le \,6\} $

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$\{1,2,3,4\}$

$\{ x:x$ is a natural number and $4\, \le \,x\, \le \,6\}  = \{ 4,5,6\} $

Now, $\{1,2,3,4\} \cap\{4,5,6\}=\{4\}$

Therefore, this pair of sets is not disjoint.

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