Question 10
A V-Tromino is made up of three $1\times1$ squares, as diagrams shown below:
All the V-Trominos must be aligned with the board cells. What is the minimum number of the V-Trominos needed to be placed on an $8\times8$ board so that one cannot fit a $2\times2$ square in the remaining space?
All the V-Trominos must be aligned with the board cells. What is the minimum number of the V-Trominos needed to be placed on an $8\times8$ board so that one cannot fit a $2\times2$ square in the remaining space?