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The image shows the 666 ways(routes) through which one can go from one point to the other in a 2×22 \times 22×2 grid.
How many different routes can you find through a 4×44 \times44×4 grid?
Note :This can be generalized for n×nn \times nn×n grid
Also try
1) Counting Squares!
2) Counting-lines!
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