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AoPS Wiki talk:Problem of the Day/September 19, 2011

Revision as of 16:14, 19 September 2011 by Negativebplusorminus (talk | contribs) (Created page with "We know that <math>f(f(x))=x</math> for this particular function. Since <math>(x,y)</math> is on the graph, <math>y=f(x)</math>; since <math>(y,z)</math> is on the graph, <math>...")
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We know that $f(f(x))=x$ for this particular function. Since $(x,y)$ is on the graph, $y=f(x)$; since $(y,z)$ is on the graph, $z=f(y)=f(f(x))=x$, so the answer is $\boxed{\textbf{(C)}}$.

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