Unusual questions: Microsoft interview questions-III. Difficulties: these questions are difficult and cannot be explained without answers.

(Note: If you want to understand the question, the answer will be immediately available. If you can't think of it, then ...... Don't try to solve it .)

1. If you ask a worker to work for you for seven days, the return is a gold bar, which is evenly divided into seven connected segments. You must give them a gold bar at the end of each day. If you are only allowed to break the gold bars twice, how do you pay your workers?
2. One train leaves Beijing at a rate of 15 kilometers per hour and goes straight to Guangzhou. Another train departs from Guangzhou to Beijing at a rate of 20 kilometers per hour. If a bird starts at a speed of 30 kilometers per hour and two trains start at the same time, and departs from Beijing, it returns to the opposite direction after encountering another car, in this way, the two trains will fly back and forth until they meet each other. How long does the bird fly?
3. You have four cans containing pills, each of which has a certain weight. The contaminated pills have a weight of + 1. How can I determine which jar of medicine is contaminated once?
4. the three switches outside the door correspond to three indoor lights respectively. The line is good. When the switch is outside the door, the indoor lights cannot be seen. Now, only one entry is allowed. Are you sure the relationship between the switch and the lamp?
5. Why is RMB only the nominal value of 1, 2, 5, and 10?
6. You have two cans, 50 red balls, and 50 blue balls. You can select one at a time and put one at a time. How can you give the biggest chance to select a red ball? In your plan, what is the chance of getting a red ball?