Operation Z
Number Theory
Level
3
The numbers \(1,2,3, \ldots , 20\) are written on a blackboard.
We define an operation \(Z\) as: Erasing two numbers \(a\) and \(b\) and writing new number \(a+b-1\) on a blackboard.
What number can be there on the blackboard after \(19\) operations?
by
Akash Shah