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In set theory, the union of two sets A,B is the set of all elements in A , in B , or both.


Given two sets A,B ,
A\cup B=\{x|x\in A\or x\in B\}


Suppose A=\{w,x,y\} and B=\{t,x,z\} :

A\cup B=\{t,w,x,y,z\}

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