23. In a serve and rally competition involving players A and B, each rally that begins with a serve by player A is won by player A with probabilityI mage and is won by player B with probabilityI mage, whereas each rally that begins with a serve by player B is won by player A with probabilityI mage and is won by player B with probabilityI mage. The winner of the rally earns a point and becomes the server of the next rally.

service protocol.