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[" 2.If "x,y=" are real and "4x^(2)+9y^(...

[" 2.If "x,y=" are real and "4x^(2)+9y^(2)+16z^(2)-6xy-12yz-8zx],[=0," then "x,y=" are in "],[[" (1) A.P."," (2) G.P."],[" (3) H.P."," (4) none of these "]]

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