1.

If x, y, z are real and \[4{{x}^{2}}+9{{y}^{2}}+16{{z}^{2}}-6xy-12yz-8zx=0\], then x, y, z are in

A. A.P                  
B. G.P.
C. H.P.                
D. none of these
Answer» D. none of these


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