EGMO 2013 - P4: Try this number theory problem out at a intermediate beginner level

TIMESTAMPS

00:00 Intro 20 - 45/60 - 120 Take 10 minutes
00:24 What the problem is
01:30 First idea
02:45 Second idea
04:45 How to deal with this b dividing this thing
06:00 Continuing the manipulation with X | Y, X | Z implies X | Y - Z
07:10 Double checking our work
07:50 Finishing up for b = 11
09:50 How to find for which x is x^5-1 divisible by 11 and finishing up
12:40 Reflecting on the problem
13:10 Thanks for problem solving :)

[-prakharroy-e]

So glad to see you back.
love your videos

[RanjeetKaur-rvrc]

Good Afternoon sir
Very helpful video

[AryanSingh-iuvt]

Nice to see that you are back!!
Btw plzz use pen and paper bcz the quality of the white board is not very good and it ruins the whole experience.

[NoBsGuidebro]

Finallllyyy you are here
I love you sir
Love your videos ❤❤❤

[acc-lab]

10:30 Why is the if and only if statement true?

[SYZY-]

pls do the jbmo 2024 number theory problem

[tiyasanandi]

Can u do it on paper as be4. It's hard to see on board.

[chiragjain]

Can someone explain why it divides n-1 and n+1? Isn’t there a possibility that it if divides n^5 + a, it doesn’t necessarily divide n+1^5

[MirProttoy-jugw]

after very very long time.can u please give me an advice to improve rapidly.i have been stuck on a same level of problem solving for a year and losing motivation

[wizixez]

Hey shef amazing video again.Can you make a video on the problem i sent you via mail?