Japanese | A Nice Math Olympiad Problem

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[@MrUtubePete]

Seems like an awful long way to get the answer

[@michaelhuppertz6738]

Other way factor f^2 multiple times: Step 1: 7^2(7^3 +7^2 + 7+ 1) + 7 Step 2: 7^2(7^2(7 + 1) + 8) + 7 Step 3: 49(49*8 + 8) + 7 Now its clear that content of the bracket reduce to 50 x 8, therefore the final calculation is 49 * ( 400 ) + 1 = 19607

[@kuldeepgoel8057]

This is a question of GP in which a=7,r=7,n=5so Sn=a(r^n-1) ________ r-1

[@Neha_Chhabra]

Exactly 💯

[@rabotaakk-nw9nm]

S5=7(7^5-1)/(7-1) !!! 😮😁🤣

[@dvs2009tula]

Super

[@soldeguzmango382]

Aplica cociente notable y te evitas la fatiga

[@Idinaher-jk7oz]

Ошибка, когда выводила за скобки 50 , проще было бы 7 возвести в пятнадцатую степень на калькуляторе 😃

[@kurtdobson]

I just type it into Matlab Symbolic. I can get a symbolic or numeric answers without hurting my brain.

[@mircoceccarelli6689]

👍👍👍😁🤪👋

[@learncommunolizer]

Thank you very much!!!

[@mohamedsalah5525]

15

[@vittalvittal6938]

19,607

[@avotini4400]

Тут обычная геометрическая прогрессия. Школьник 6 класса решит.

[@angusmackaskill3035]

7 to the power of 15

[@michaelhuppertz6738]

Be careful + operant not * between the 7 powers.

[@edstudio6181]

No !

[@senthoorran]

This can be more easier 49 x 50 x 8 = 49 x 50 x 2 x 4 = 49 x 100 x 4 = 196 x 100 = 19600

[@Demeccafree]

I been quit

[@ayugaming3047]

But for the case is not 'watch hours' 😁 Thanks man, same formula here.

[@nilsalmgren4492]

Faster just to calculate

[@debsuki]

People in the comments section seems to not understand this video, they say they can solve it much faster with a calculator. The things is, this video teach us how to solve a question like this, because a normal person don't know the value of 7⁸ and plus.

[@fd2824]

111110

[@user-qy8re3yx3d]

19607 по формуле суммы членов геометрической прогрессии.

[@Demeccafree]

Dude

[@manishvidhya6778]

Lack of basic understanding of tables

[@yclinb]

Are you crazy?? (7^6-1)/6

[@matthewmiller6979]

Super simple 11111(base 7) 😅

[@fd2824]

111110

[@tuannguyendinh4321]

Chán quá

[@user-rc3om9jf5i]

There would be a better and easier way...

[@samuilrivkin4558]

У меня получилось намного быстрее - просто я не решал этот бессмысленный пример, неимеющий никакого практического смысла

[@user-rn2sk9od3u]

Гуд

[@thebasisti2482]

16807+2401+343+49+7=19607