1.

Let x,y and z are positive reals and x ^(2) + xy + y ^(2)=2,y ^(2)+yz+z ^(2) =1 and z ^(2) +zx+x^(2) =3. If the value of xy + zx can be expressed as sqrt((p)/(q)) where p and q are relatively prime positive integral find the value of p-q,

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ANSWER :5


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