A mathematician and a non-mathematician are sitting in an airport hall waiting for their flight to go.
The non has terrible flight panic."
Hey, don't worry, it's just every 10000th flight that crashes."
"1:10000?
So much?
Then it surely will be mine!"
"Well, there is an easy way out.
Simply take the next plane.
It's much more probable that you go from a crashing to a non-crashing plane than the other way round.
So you are already at 1:10000 squared."
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