help. “i’m stuck in here, and i don’t have my phone. please call my boss” , the repairman wrote along with his boss phone number. police said some customers thought the notes were a joke, but one decided to give them a call. police had to kick down a door to get the repairman out. we must choose m so that n divides 10m+1.
now, this is all a mouthful. you need to first work through all of this to see why m=2 for the case of n=7. then, test it out for other n such as 3, 9, 11, 13, and even 73! 