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If x,y,z are real and 4x^(2) +9y^(2)+16z...

If x,y,z are real and `4x^(2) +9y^(2)+16z^(2) -6xy-12yz-8zx` =0 then x,y,z are in

A

A) A.P.

B

B) G.P.

C

C) H.P.

D

D) None of these

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