Well, Eubulides was pretty famous for his logical paradoxes one of which is :
"this statement is false".
Another example (modified) is the following paradoxical proof by induction :
Every positive integer is a whole lot less than 1000000.
Proof:
Base case. 1 is certainly a whole lot less than 1000000.
Induction step.
If the positive integer k is a whole lot less than 1000000, then certainly k+1 , which is just slightly bigger than k, is still a whole lot less than 1000000.
Hence, by mathematical induction, the statement is true for all positive integers.
In particular, a billion is a whole lot less than a million.
What would you say?
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