IMO 1992 - Problem 1

00:00 Intro 25 - 45/90 - 150 Take 15
00:30 Lessons from shooting the problem
01:15 First idea - Orders of magnitude
03:30 Second idea - Making the estimate
05:00 The helper for the estimate
06:05 Using the helper inequality
07:30 Divisibility idea before casework
09:30 The use of a little idea
10:00 Casework a = 3
14:50 Casework a = 2
22:25 Lessons from the problem
24:50 Thanks for problem solving :)

BOUNDING IN DIVISIBILITY | BOUNDING | DIVISIBILITY | CASEWORK

[jonasjeager]

Sir can you please make a courses about imo math topics

[Maths_.]

Please make a video on this question
Find the number of subsets of {1, ..., 2000}, the sum of whose elements is divisible by 5. {High-School Mathematics, 1994/1, Qihong Xie}

[anushkakar]

Sir can u please tell how to solve the integration [(t-1)^3/2 ]/t dt ? Also please mention the method used for the same