If $U = \{x : x i s a n a t u r a l n u m b e r l e s s t h a n 20\}$ , then find its subsets $R$ such that
$R = \{p r i m e n u m b e r s\}$

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Solution

Given taht, $U = \{x : x i s a n a t u r a l n u m b e r l e s s t h a n 20\}$
$\Rightarrow U = \{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20\}$
its subset $R$ is given as $R = \{p r i m e n u m b e r s\}$
Therefore, $R = \{2, 3, 5, 7, 11, 13, 17, 19\}$

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