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digital electronics bca 1 st sem question answer...Please give me the details

suppose not natural numbers is the universal set and A ={n/n <6} ,B={n/n <9},C {1,3,5,7,8,9},D={2,3
,5,7,8}
Find that :
1)A union B
2)B enter section C
3 ) A enter (B n D )
4) ( A nB ) n (A new D)

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