This exercise and the one that follows are due to Anthony Qttas. A 2"  ×  2" L-sha...

This exercise and the one that follows are due to Anthony Qttas. A 2"  ×  2" L-shape, n > 0, is a figure of the form

  with no missing squares. Show that any 2n × 2 n L-shape can be tiled with trominoes.