GERMAN | A Nice Olympiads Trick | No Calculated Allowed

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[@SciFiFan53]

By the time you go through all the algebraic malipulations and still end up multiplying a bunch of numbers together, it would have been quicker and simpler just to do the original calculation by hand.

[@willisknapick4405]

With my phone calculator it took about 10 seconds. If I didn't have to go back to the beginning to recall the original numbers....ah, 5 seconds?

[@brendanward2991]

It took me 3:15 to simply multiply 5 by itself 11 times and subtract 9.

[@Nikioko]

The last digit is definitely a 6. And the second to last digit is a 1. The third to last digit, however, must be a 1 as well. And there I have to stop.

[@learnwithchristianekpo6005]

Can you guess without a calculator?😊

[@RealQinnMalloryu4]

5^11^1 ➖ 3^1 5^1^1 ➖ 3^1 1^1 ➖ 3^1 13:(x ➖ 3x+1) .