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If $f(x)=\frac{ax+b}{cx+d}, abcd\not=0$ and $f(f(x))=x$ for all $x$ in the domain of $f$, what is the value of $a+d$. 

 Apr 30, 2021
 #1
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a + d = 4.

 May 2, 2021
 #2
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That's incorrect. 

 May 3, 2021

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