Probability

The Lost Boarding Pass

Difficulty
x xxxxx xxx xxx xxxxxxxxxx xxx xxx xxxxxxxx xxxxx. xxxxxxxxx x xxx xxxx xxxxx xxxxxx xxx xxxxxxx x xxxx xxxxxxxxx xx xxxxxx. xxxx xxxxx xxxxxxxxx xxxxx xxxxx xxxxxxxx xxxx xx xx xx xxxxxxxxx; xxxxxxxxx, xxxx xxxxxx xxxxxxxxx xxxxx xxx xxxxxxxxx xxxxx. xxxx xx xxx xxxxxxxxxxx xxxx xxxxxxxxx xxx xxxx xx xxxxx xxxxxxxx xxxx?

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