Question 10
How many shortest paths along a 3 × 3 grid lead from one corner to the diagonally opposite corner?
Editorial clarification: use 3 rows and 3 columns of vertices, joined horizontally and vertically, as illustrated. This is a grid of 2 × 2 square cells. Travel from A to B along the drawn segments.
**Input:** Choose one option.
Editorial clarification: use 3 rows and 3 columns of vertices, joined horizontally and vertically, as illustrated. This is a grid of 2 × 2 square cells. Travel from A to B along the drawn segments.
**Input:** Choose one option.