BMO 2009 - P1

TIMESTAMPS

00:00 30 - 60/90 - 150 Take 15 minutes
00:25 Understanding the problem and coming up with solutions
00:47 Trying a general approach for these types of problems
03:20 The next common heuristic
05:00 Solving the next pair of equations and what we need to focus on
10:20 Checking under which conditions the other side has the appropriate remainder
11:40 The reasoning behind picking the next modulo and finishing
14:55 Getting all the solutions
15:38 Reflecting on the problem
19:28 Thanks for problem solving :)

MODULAR ARITHMETIC | DIFFERENCE OF SQUARES

[Ritesh_.]

20 days fr my next stage math olympiad .
But still enjoying it without any pressure

[amirz]

9:35 It would be much easier if you used LTE