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If A={5,6,7} and B={7,8,9} then A uu B i...

If `A={5,6,7}` and `B={7,8,9}` then `A uu B` is equal to
(a)`{5,6,7,8,9}`
(b)`{5,6,7}`
(c)`{7,8,9}`
(d) None of these

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