i don't know the answers to a single one of those questions. i'd just punch the interviewer in the face and be like "so are you going to hire me or not asshole?"
That's not a valid solution because you're assuming the guy holds on to at least part of what you gave him previously. There clearly is no solution to this one, just the "clever" solution "they" want. Meh. Some of the question are pretty decent, though (IMO). I like at least the pill question (didn't get the clever answer right away), the primes, the marbles (though really easy), and the balls question. I like the 17 people question too but I've seen it before (here in fact).
Edit: to clarify, yes, you can make assumptions, but not those that invalidate the quesiton. So by requiring the guy to hold on to his gold, you are effectively not paying him every day.
Due to the internet,and the wide spread knowledge of MS type questions, they no longer ask these questions. You'll probably get it once or something, but it isn't as important anymore. They will most likely test you on coding, and designing. Seeing that you're optimal in your solution, and that your thought process is that of a true MS employee.
It's hard to imagine people doing this in an acutal interview in about 30 seconds.
For the first one, I got a different answer - It's round because a circle has optimal perimeter (for the surface area) as opposed to a square - so a lot of water could flow through. I could be wrong though.
No one got this one?
Supposing you had 12 balls, ONE of the balls was either lighter OR heavier (you don't know) than the other. What is the least amount of times you can use the scale to determine the odd ball.
It's a nice problem. The answer is 3, but how to do it in 3 weighings is a bit tricky.
For the first one, I got a different answer - It's round because a circle has optimal perimeter (for the surface area) as opposed to a square - so a lot of water could flow through. I could be wrong though.
No one got this one?
Supposing you had 12 balls, ONE of the balls was either lighter OR heavier (you don't know) than the other. What is the least amount of times you can use the scale to determine the odd ball.
It's a nice problem. The answer is 3, but how to do it in 3 weighings is a bit tricky.
Anyone interested in these type of puzzles should check out:
How Would You Move Mount Fuji? : Microsoft's Cult of the Puzzle -- How the World's Smartest Companies Select the Most Creative Thinkers
Great read.
How Would You Move Mount Fuji? : Microsoft's Cult of the Puzzle -- How the World's Smartest Companies Select the Most Creative Thinkers
Great read.
I was interviewed by Microsoft last week and they didn't ask me any off-the-wall questions such as these at all. Pretty much the whole interview was having me write a function in C that solved a certain math problem, then doing it differently, then pointing out flaws. They just wanted to see how I tick. Didn't go over my resume or anything academic at all.
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