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Posted

Hey guys, I accidentally stumbled upon this really neat math puzzle. Really enjoyed it a lot and I'd say it's certainly the hardest and most fun math puzzle I ever encountered (not that this necessarily means much though  :) )

Anyway, I thought some people here might also enjoy it so there you go. Explanation is in the first 3:30 afterwards the solution(s) are presented, so be sure to stop (though the guy in the video will remind you too, so don't worry about keepng an eye on the timer)

 

http://www.youtube.com/watch?v=DoRB7FL02t4

 

Have fun and let me know how it went :)

 

p.s. I solved all except for the ones and zeros. Though I regret giving up at that point, I'm sure sooner or later I MIGHT'VE figured out the ones at least :)

Posted

Are square roots allowed? You can draw the symbol without drawing a number, so I think this technically is within the rules (you can't "draw a number"), but the symbol is really shorthand for a power of 1/2, so it seems a bit like cheating when powers of other numbers are disallowed.

Posted

yeah square roots are allowed. (Can't do cube roots though for instance). Yes, symbols that don't have a number in them are allowed, even if it could be written using a number and mean the same thing mathematically. 

Posted

So far I have 8/10 then. Not looking forward to 0 0 0...

 

edit: I thought I had the solution using lots of "i", although I wasn't sure if that counted as a number or a symbol. They should probably specify that you can only use operations. Seeing the answer, theirs is certainly cleaner. I did solve 8s differently though. 

Posted

I was able to get 2,3,4,5,6,9

 

Then i watched the solution and saw that no matter long I pondered I would have never gotten the rest because i didn't have enough knowledge of math.

 

So I consider this a victory for myself.

Posted

cool, ah yeah, the one with using numbers that are letters, indeed they shoudl've clarified this a bit better :)and yeah, I wouldn't have been able to do the 0's either (though I knew of  the operation, I just didn't know it worked that way with the zero)

Posted

Oh, so you didn't do the 10 minutes thing then? (Or did you get so far in ten minutes? if so, wow, kudos :) )But idk, the only thing I figured that helped in the low numbers was getting 1 with 4/4 and make odd numbers that way.

Posted

I didn't time myself, just tried to go until I got stuck. The only ways I can get an odd number require at least two of the 4's (like 4/4), so that doesn't leave many options to get to 31...

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