Art of Problem Solving: 2015 AMC 10 A #23 / AMC 12 A #18
4:40
Art of Problem Solving: 2015 AMC 10 A #24 / AMC 12 A #19
8:51
Art of Problem Solving: 2020 AMC 10 A #25 / AMC 12 A #23
4:32
Art of Problem Solving: 2015 AMC 10 A #21 / AMC 12 A #16
11:34
3 factoring tricks that you probably didn’t know
11:04
A nice number theory problem from an Argentinian math olympiad
9:38
Art of Problem Solving: 2020 AMC 10 A #22
11:51
Art of Problem Solving: 2017 AMC 10 A #25
9:44