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1. If A and B are non empty subsets of a set,then (A-B)U(B-A) equals? 2.Let A ={x:xE R,|x| =1} and AUB=R-D,then the set D is: 3.If the sets A and B are defined as: A={(x,y):y=1/x,x is not equal to 0,xE R}; B={(x,y):y=-x,E R},then :
1. the answer is A U B
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