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 Hint
Count the number of grid squares on each grid board.
- How many T-tetrominoes are needed to cover a 4 x 4 grid
board?
- How many grid squares are on a 5 x 5 grid board? Remember
that T-tetrominoes each have four grid squares.
- View the 6 x 6 grid board colored as a checker board.
A T-tetromino would cover 1 white and 3 black
squares ( ) or
1 black and 3 white squares ( ).
The number of black and white squares is the same, so a cover
would need half the T-tetrominoes covering 1 white and 3 black
and half covering 3 white and 1 black. Can we do that?
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Knee-knocker
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