Your task is to determine which switch controls which bulb. You are in a room with three light switches, each of which controls one of three light bulbs in the next room. now divide the resulting shape into four identical shapes. now divide the resulting shape into four identical shapes.ĭraw an equilateral triangle (all sides same length). Yet amusingly, the Microsoft campus uses square manholes.ĭraw a square. Note: This is a famous Microsoft question. if so, how? if not, why? prove your claim. Using 31 dominoes, where one domino covers exactly two squares, can you coverĪll the empty squares on this chessboard (which has only 62 spaces, since two opposite corner squares are removed). you make this interjection because you are very smart, and you know that if you However, at this point you immediately interject, and ask if you can go first Loses." you guys are about to start playing, and the devil says that he'll go first. the first guy who can't put a quarter down He says "ok, we'll take turns putting quarters down, no overlapping allowed, and the he gives himself and you a huge pile of quarters. You die and the devil says he'll let you go to heaven if you beat him in a game. The arrangement above, for example, is wrong because 3 and 4, 4 and 5, 6 and 7, and 7 and 8 are adjacent.
How can they find their average salary, without disclosingĪrrange the numbers 1 to 8 in the grid below such that adjacent numbers are not in adjacent boxes (horizontally, vertically, or diagonally). However, they are self-consciousĪnd don't want to tell each other their own salaries, for fear of either being ridiculed Three coworkers would like to know their average salary. How can Andy transfer the gold pendant to Grant without it being stolen? (where both sides have encryption capability, and where unsecured items are taken away rather than just copied?) Anything that is not padlocked in the safe will be stolen by the bellhops - including any unlocked padlocks, the keys or the pendant. (So 1 gold pendant, 2 safes, 2 padlocks, and 2 keys.) But the bellhops are thieves. Both Andy and Grant have a padlock and a corresponding key. Both Andy and Grant have a safe with a large clasp that can be secured with a padlock.
The only way they can transfer objects is by using the bellhops. Andy needs to give a gold pendant to Grant, but spies are trying to assassinate Andy and Grant so neither of them can leave their room. How can you send the object securely?Īlternative, more precise phrasing: Andy and Grant are staying in different rooms in the same hotel. Unlocked box, the key could be copied en route. However, your friend does not have any keys to your locks, and if you send a key in an You have a box which can beįitted with multiple locks, and you have several locks and their corresponding keys. You want to send a valuable object to a friend securely. all normalĪssumptions about directions will be used. The south pole) is illogical and therefore does not enter into the problem. also note that walking north from the north pole (or south from Hint 1: think you've figured it out? do you know that there's more than one? in fact, thereĪre more than two. On a static sphere if that makes the problem less complicated to you. The rotation of the earth has nothing to do with the solution you can assume you're walking you can start at any point on the sphere. West, then one mile north and end up in the same spot? to be precise, let's assume theĮarth is a solid smooth sphere, so oceans and mountains and other such things do notĮxist. How many places are there on the earth that one could walk one mile south, then one mile Latest additions to cover site can be seen by clicking here. RECENT ADDITIONS Check out latest puzzles by perusing the forum and the 10 most recent posts. Thousands of posts by really clever people. Want to test-drive a new riddle of your own? I don't know the solution to this problem myself. Needs math past arithmetic and basic probability. Page last modified Friday, 0 04:17:11 PST
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