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Let f x = (ax+b)/(xa+d), where a,b,c d a...

Let `f x = (ax+b)/(xa+d),` where a,b,c d are non zero If `f (7) =7,f (11)=11 and f(f (x))=x ` for all x expect `-d/c.` The unique number which is not is the range of f is

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