Probability

Four Chords on a Circle

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

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