Can open all keys of door

The key that can open all doors my a friend is a dormitory managing person in an university, once chat, she told me an interesting affair.The building that she manages lives a group of boys, each dormitory is four people, a key of everybody.These students love to sleep very much lazy feel, the total love dragged along to quickly have a class to just in a hurry get up to brush teeth to wash face, then headed straight for the classroom.Wait until class is over come back, on touching pocket, Be getting worse, the key forgot in the dormitory, hence can wait other classmates to come back to open the door.In four individuals always 12 people take key.Can always have so several times, all of four people forgot to take key, hence is whole be blocked up outside the dormitory.Can't, can seek a dormitory managing person,oakley sunglasses for sale is also my friend, she maintains the backup key of the whole building all dormitories.The number of times is many, the friend then feels to bother.She settled a rules, each dormitory sought the number of times that she wants key every semester get not over three times, more than three, oneself seeks tool to pry open lock, then takes out money to buy to chase new.Expect the time of end, the friend did a statistics of the circumstances of all dormitories, she discovered an interesting phenomenon:Several 5th floors dormitory that connects together, 501-506, incredibly don't also bother her to open to pass by door at a time!A record also have no of dormitory not is have no, can have six dormitories now, and still connect together.This interest that aroused a friend.For untying the Yi regiment of in the mind, the friend specially knocked to open 504 doors and finally knew their secrets.Originally, they each dormitory went together with another a new key and deposited the next dormitory.Say so and make six dormitories and six keyses weaving the number respectively, their way be:Make the key depositing the dormitory 12, make the key depositing the dormitory 23, push according to this kind, finally make the key depositing the dormitory 61.In this way, in 24 individuals as long as a person took key, that owners can't be blocked up outside the dormitory, because as long as having a key, can open a door first, then obtain the second opens the second door to the key, so, until open all doors.Hear here, I cannot help but taking out a pen to calculate for a while.Are it 50%(actually should less than this number) to suppose each student to forget several rates of taking the key, so will can't appear the circumstance that none of 24 students takes key?Is theoretically possible,cheap tisa hats can calculate from all leading a theory, this several rates should be that the 1/16777216 is several near zero!I start to can not help admiring the young man of this group cleverness.They trust each other, each other cooperation.The lacking unity is respectively a wartime, everybody has the time to fluster ;But only shoulder to shoulder stand to arrive to face a problem together and together, so as to dig out the biggest potential, by this time, the problem usually becomes defenseless, because of by this time, everybody's hand inside all many a key, a can open all keys of door.
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