Probability

Keypad Parity Hop

Difficulty
xx xxx xxxxxxx x×x xxxxx xxxxxx (xxxxxx x), xxx xxxxx xx x xxxxxxxxx-xxxxxx xxxxx, xxx xx xxxx, xxxx xxxx xxx xxxxx; xxxx xxxx xxxx xx x xxxxxxxxx xxxxxx xxxxxxxxxxxx xx xxxxxxxxxx xxxxxxxx xxx (xx xxxxxxxxx), xxx xxx xxx xxxx xxxx xxxxx xxx xxxx xx. xxxxx xxxxx xxxxxx xxx xxxxxxxx, xxxx xx xxx xxxxxxxxxxx xxxx xxx xxxxxxxxx x-xxxxx xxxxxx xx xxxxxxxxx xx x?

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