Problem
COM-B1-M06-P001 Adding Two
#1
★☆☆☆☆ Level 1 of 5
The number \(4\) is written on a board. In one move, one may add \(2\). Can \(99\) be obtained?
Parity does not change.
The initial number is even, and adding \(2\) preserves parity. The number \(99\) is odd, so it cannot be obtained.
The simplest invariant.