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[" If "x=sum(n=0)^(oo)a^(n),y=sum(n=0)^(...

[" If "x=sum_(n=0)^(oo)a^(n),y=sum_(n=0)^(oo)b^(n),z=sum_(n=0)^(oo)c^(n)],[" Where a,"b" ,care in "A" .P.and "|a|<1,|b|<1,|c|<1" then "x,y,z" are in "],[[" A."G.P," B.A.P "," C.Arithmetic- "," D.H.P "],[," Geometric "," Progression "]]

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