Probability

Exactly Half Heads

Difficulty

xxx xxxxxxxxxxx xxxxxx xx x xxxx xxxx, xxxxx xx xxxx xxxxxx: xxxxxxx xxx xxxx xx xxx xxxxxx xx xxxxxxx xxx xxxxx xx xxxx xxxxxx? xxxxx xxxx xxxxxxxxxx xxxxxx xx xxx xxxx xxxx xxxxxx, xxxx xxx xxxx xxxxx xxxxxxxxxxx xx xxxxx xx xxxxx xxxx?

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