Detailed description
A three by three grid of squares is shown. The vertices of the square are labelled from the bottom left corner D, A, B and C. The numbers of paths from D to each point on the grid are labelled.
One path from D to B is marked. It starts at D, one unit to the right, one unit up, one unit to the right, one unit up, one unit to the right, one unit up to arrive at B.
