The Hardest Problem To Ever Exist | Einstein Failed To Solve This

In todays video, I will be teaching you how to solve an interesting problem. Make sure to like, subscribe, and also comment any questions or video ideas you may have relating to math!
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[fraserorr]

TBH this is fairly bogus. At various stages you multiply out, for example 3^6 = 729. Which is fine, except that if you are going to do that you might as well just multiply out 3^13 and subtract 1. So all the manipulation is not useless. And how exactly can you claim that Einstein couldn't solve this? Presumably he could do it before his morning coffee. I could, and I'm no Einstein.

[richardmullins]

3 (3^12 - 1) = 3 (9^6 - 1) =3 (81^3 - 1). I guess with practice you could learn to work this out in your head???? It's said that Gauss could multiple 20 digit numbers in his head???!!!. calc says 3 x 531440 = 1, 594, 320

[MrChesemis]

Ok nevermind I got it my brain just had an overlap

[MrChesemis]

How can I memorize all these formulas?

[MrChesemis]

sorry, Im not to good at math, but how do you factor out 3 at 0:44 by hand? I know the math is right, but how do you get to that result?