Solve this :

$6 . (i) I f U = \{x : 0 \leq x \leq 10, x \in W\} a n d A = \{x : x i s a m u l t i p l e o f 3\}, f i n d A' (i i) I f U i s t h e s e t o f n a t u r a l n u m b e r s a n d A' i s t h e s e t o f a l l c o m p o s i t e n u m b e r s, t h e n w h a t i s A ?$

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