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[" 8.If "x,1,z" are in A.P.and "x,2,z" a...

[" 8.If "x,1,z" are in A.P.and "x,2,z" are in G.P.,then "x,4,z" are in "],[[" (a) "AP," (b) G.P."],[" (c) H.P."," (d) none of these "]]

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