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Write down the complement of given set A...

Write down the complement of given set A
(i) N is universal set, A=`{x:x in N and x gt 7}`
(ii) Univesal set is collection of all letters of word CATARACT
A={x:x is a letter of word RAT}

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(i) {1,2,3,4,5,6,7}
(ii) {C}
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