Probability

Sum Until a Decrease

Difficulty
x xxxx xxx xxxxxxxx \(x\) xxxxxxx \(xx\) xx xxxxxx xxxxxxxxxx. xxx xxxxx xxxx xx xxxxx xx x xxxxxxx xxx. xxxx xxxxxxxxxx xxxx xx xxxxx xx xx xx xx xxxxx xx xxxxx xx xxx xxxxxxxx xxxx; xxxxxxxxx, xxx xxxxxxx xxxxx xxxxxxx xxxxxx xxxx xxxx. xxxx xx xxx xxxxxxxx xxxxx xxx? xxx xxxxxxx, xxxxx xx \(x,x,xx,xx\) xxxxxxx x xxx xx \(xx\).

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