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2017-11-08 17:39:50 +01:00
Starting in the top left corner of a 2×2 grid, and only being able to move to the right and down, there are exactly 6 routes to the bottom right corner.
2018-01-01 23:03:05 +01:00
![Grid Image](/data/images/blog/p015.gif)
2017-11-08 17:39:50 +01:00
How many such routes are there through a 20×20 grid?