A short and tricky number theory problem | IMO 2007 P5

In today's video we go over one of my favourite number theory problems that came in the IMO. The problem statement is quite short, yet the problem is surprisingly challenging. The method of infinite descent is used here which I think is one of the most elegant ways to arrive at a contradiction. If there's any problem you want to see me solve, suggest it in the comments. Related Links : My Instagram Account :   / creative_math_   IMO 2007 QP : https://www.imo-official.org/year_inf... IMO 2007 SL : https://www.imo-official.org/problems... IGMO homepage : http://mathsforall.co.in/igmo-2020/