Let `f(x)=(ax + b )/(cx+d)`. Then the `fof (x)=x`, provided that : `(a – InterviewSolution

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1.	Let `f(x)=(ax + b )/(cx+d)`. Then the `fof (x)=x`, provided that : `(a!=0, b!= 0, c!=0,d!=0)`A. `d=-a`B. d=aC. `a=b=c=d=1`D. `a=b=1`
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