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[" Q9.Let "f(x)" be a non-zero function,...

[" Q9.Let "f(x)" be a non-zero function,whose all successive derivatives exist and are non-zero.If "f(x)" ,"],[f'(x)" and "f''(x)" are in G.P.and "f(0)=f'(0)=1" ,then "],[[" (A) "f(x)>0quad AA x in R," (B) "f'(x)>0,AA x in R],[" (C) "f''(0)=1," (D) "f(x)<=1AA x in R]]

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