Found on YouTube: Only Genius can see the right number | IQ Test #math #short #math part 7

Only Genius can see the right number | IQ Test #math #short #math part 7
Maths at Your Fingertips
Only Genius can see the right number part 3 | IQ Test #math #short #math part 7.
https://www.youtube.com/watch?v=nT631JjRXDM