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If x=2015, y=2014 and z=2013 then the value of x2+y2+z2 - xy - yz - zx is,

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If x=2015, y=2014 and z=2013 then the value of x<sup>2</sup>+y<sup>2</sup>+z<sup>2</sup> - xy - yz - zx is,






 
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