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[" If "x,y,z" and "w" are non-zero real numbers and "],[x^(2)+5y^(2)+5z^(2)+4w^(2)-4xy-4yz-4zw=0" ,then "],[x,y,z,w" are in "],[[" (1) "" A.P."," (2) A.G.P."],[" (3) H.P."," (4) G.P."]]

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