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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 2

  • question_answer
    If  \[\frac{a+bx}{a-bx}=\frac{b+cx}{b-cx}=\frac{c+dx}{c-dx},\] \[x\ne 0,\] then a, b, c, d, are in

    A) A. P.               

    B) H.P.     

    C) GP.                 

    D) None

    Correct Answer: C

    Solution :

    \[\frac{a+bx}{a-bx}=\frac{b+cx}{b-cx}=\frac{c+dx}{c-dx}\]\[\Rightarrow \,\,\,\frac{a}{bx}=\frac{b}{cx}=\frac{c}{dx}\] (using componendo and divideado) \[\Rightarrow \,\,\frac{a}{b}=\frac{b}{c}=\frac{c}{d}\]


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