Suppose identical tags are placed on both the left ear and the right ear of a fox. The fox is then let loose for a period of time. Consider the two events C1={left ear tag is lost} and C2={right ear tag is lost}. Let Ο=P(C1)=P(C2), and assume C1 and C2 are independent events. Derive an expression (involving Ο) for the probability that exactly one tag is lost given that at most one is lost.