Art of Problem Solving: 2016 AMC 10 A #25 / AMC 12 A #22
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4:32
Art of Problem Solving: 2015 AMC 10 A #21 / AMC 12 A #16
![](https://i.ytimg.com/vi/9MXP7rkr5ms/mqdefault.jpg)
2:42
1984 USAMO Problem #1
![](https://i.ytimg.com/vi/HOtyh9qycrI/mqdefault.jpg)
12:05
Art of Problem Solving: 2012 AMC 10 A #25
![](https://i.ytimg.com/vi/_hZNSJsRNzY/mqdefault.jpg)
9:46
Art of Problem Solving: 2015 AMC 10 A #25 / AMC 12 A #23
![](https://i.ytimg.com/vi/R3eJW3PCYMs/mqdefault.jpg)
5:51
2016 AMC 10A Prob 20
![](https://i.ytimg.com/vi/3jnbBVpOf40/mqdefault.jpg)
4:38
A tricky problem with a "divine" answer!
![](https://i.ytimg.com/vi/PGJubCoH5as/mqdefault.jpg)
31:51
Solving Mathematics in 'The Man Who Knew Infinity' (Ramanujan)
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7:10