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BrainDen.com - Brain Teasers


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About EventHorizon

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  1. I'm sure I know what BMAD was saying. Yes, ignore the units / squared units difference. The problem doesn't involve a circle though. You need to find a function f(x) such that the area under the curve between two points is the same as the arc length between those two points along the function. Here the arc length is like the length of a string representing the function cut at the two points. How to find the arc length of a function: Restatement of problem using previous spoiler: One answer is simple, the other is less so.
  2. I looked at that for a while. Though it's not much, here's what I got...
  3. This puzzle is not quite solved yet. So here's my attempt
  4. I installed the plus4 app, and it is just a mastermind clone. +x means you have x numbers in the right spot, and -x means you have x numbers right, but they are in the wrong spots. It could be that a guess would result in +2-2, meaning that you have all the right numbers, but two are in the wrong spots.
  5. So the best you can do is 00 00 or 0 0 ... 0 0 000...00
  6. Looks like I misunderstood the initial configuration. I assumed the x's were already amoeba and not just space to vacate.
  7. Example 2 is not looking good. Perhaps it is unsolvable....
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