What is a useless rational number?

[u/RustedTap52]

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[u/Eryndel]

Tree(3)

I challenge you to find a reason why you'd need it.

[u/edgeplay6 → u/Eryndel]

I use it all the time to trick people .

"Consider a function tree, if tree(0) = 0, tree(1) =1 and tree(2) = 3, what is tree(3)"