Question: In Java please Starting in the top left corner of a 2x2 grid, and only being able to move to the right and down, there

In Java please

In Java please Starting in the top left corner of a

Starting in the top left corner of a 2x2 grid, and only being able to move to the right and down, there are exactly 6 routes to the bottom right corner. How many such routes are there through a 20x20 grid

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