Probability

Head–Tail Cancellation

Difficulty

xxx xxxxxxx $x xxxxx xxx xxxxxxx xxxxxxxxxxxxx, xxxx xxxx xx xxxxx xxxxxx xx xxxxxxx xxxxx xx xxxxx. xxxxx xxxxxxxxxx xx xxx xxxx xxx xxx xxxx xxx xxxxxxx xxxxx xx xxxx xxxx xxxxxxx. xxx xxxxxxx xxx xxx xxxxxxxxx xxxxx. xxxx xx xxx xxxx xxxxx xxxxx xxx xxxx xxxx?

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