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यदि `A ={1, 2, 3, 4}, B ={3, 4, 5, 6}, C ={5, 6, 7, 8}` और `D ={7, 8, 9, 10}` तो निम्नलिखित को ज्ञात कीजिए। `B uu C uu D`

Answer» `B uu C uu D={x : x in B` या `x in C` या `x in D}`
`={3, 4, 5, 6, 7, 8, 9, 10}`


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