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Which of the following sets are equal?X={1,-1}, Y={-1,1}, Z={x : x is root of x2-1=0 and x is an integer}

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Which of the following sets are equal?<br />X={1,-1}, Y={-1,1}, Z={x : x is root of x<sup>2</sup>-1=0 and x is an integer}






 
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