74. A hunter shoots at a fox running away from him for the first time from a distance of $100 \mu$; let the probability of hitting the fox from this distance be ${ }^{1} / 2$ (i.e., from a distance of $100 m$ the hunter hits the running fox as often as he misses). In the event of a miss, the hunter reloads his gun and shoots again, but by this time the fox has moved away another 50 m. In the case of a second miss, he reloads the gun and shoots a third (and final) time; during this time, the fox moves away another 50 m. Assuming the probability of hitting is inversely proportional to the square of the distance, determine the probability that the hunter will succeed in hitting the fox.