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 Q such that
$Q = \{o d d n a t u r a l n u m b e r s\}$

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Solution

$U = \{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20\}$
its subsets Q was given as $Q = \{o d d n a t u r a l n u m b e r s\}$
therefore, $Q = \{1, 3, 5, 7, 9, 11, 13, 15, 17, 19\}$
Universal Set: A set that consists of all elements of different sets under consideration is called the universal set. It is represented by U or ξ

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