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[" 48.If "a,b,c,d" are in G.P.,then "(a^...

[" 48.If "a,b,c,d" are in G.P.,then "(a^(3)+b^(3))^(-1),(b^(3)+c^(3))^(-1),(c^(3)+],[d^(3))^(-1)" are in "],[[" (a) A.P."," (b) G.P."," (c) H.P."," (d) None of these "]]

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