1.

If\[{{x}^{3}}+{{y}^{3}}+{{z}^{3}}-3xyz=k(x+y+z)\] \[\{{{(x-y)}^{2}}+{{(y-z)}^{2}}+{{(z-x)}^{2}}\}\], find\[k\].

A.  \[1\]                            
B.         \[\frac{1}{4}\]
C.         \[\frac{1}{2}\]                         
D.         \[\frac{1}{3}\] 
Answer» D.         \[\frac{1}{3}\] 


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