Answer:
Yes, no, no, no
Step-by-step explanation:
The first method is random. There's no bias in selecting fans spaced out evenly as they enter.
The second method is not random. It is biased towards those who hear the announcement and wish to participate.
The third method is not random. It is biased towards those in the biggest rush to leave.
The fourth method is not random. It is biased towards those with the best seats.
