Kaprekar's Constant
15:10
Prove that (1/x + 1/y + 1/z) is greater than 3
11:30
163 and Ramanujan Constant - Numberphile
28:28
Russell's Paradox - a simple explanation of a profound problem
31:33
The Oldest Unsolved Problem in Math
12:11
Simple Explanation of the Birthday Paradox
10:05
This Trick CANNOT Be Explained - Revealed
11:14
The Man Who Solved the World’s Most Famous Math Problem
11:59