Probability

First Box to Empty

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

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