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Answer is 8 :
because they said how many elements so A U B = {1,2,3,4,5,6,7,8} this group consists of 8 elements , try to Count the elements of your result
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Basics of Sets and Relations #1
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Answer is 8 : because they said how many elements so A U B = {1,2,3,4,5,6,7,8} this group consists of 8 elements , try to Count the elements of your result