Probability

Symmetric Barriers with a Deadline

Difficulty
x xxxxx'x xxxxx xxxxxxx xxxxxxxxxxxxx xxxx xxxxxx, xxxxxx xx £x xx xxxxxxx xx £x xxxx xxxxx xxxxxxxxxxx. xx xxxxxxxxx xxxxx xxxxxxxxxx xxxx xxx xxxxxxxxxx xxxxx xxxxxx xxxxx xxxxxxx xxxxxx \(+£x\) xx \(-£x\), xxxxxxxx xxxx xxxx. xxxxx xxxx xxx xxxxxxxxx xxxxx xxxxxx xxx xxxxxxx, xxxx xx xxx xxxxxxxxxxx xxxx xx xxxxx xx \(+£x\)?

This brainteaser is only available to subscribers.

See plans

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.