Unusual bets and prop wagers
Can a four-sided coin have fair odds?
Direct answer
Yes. A symmetric four-faced die can give each face probability 25%; a four-outcome spinner can do the same. It is not a conventional two-sided coin.
How to use this answer
This answer is based on the mathematical principle or published rule identified in the source below. If the question involves a live betting market, confirm its settlement definition before applying it to a specific bet.
It is not a standard coin, but a symmetric four-outcome spinner or die can assign equal 25% probabilities.
Novelty and prop markets depend on their written definitions. Find the precise wording, qualifying period and published result source; an ordinary sporting rule does not always decide how a novelty bet settles.