
Yes..I can do that but the process will take a lot of time, specially for bigger dimensions. Is there any mathematical way?
The answer key was (10c4)((5c2)x(5c2))((6c2)x(4c2))+((5c2)x(4c2))
10c4 is the total number of ways going from x to y and 5c2 is the number of ways crossing the park. What about the other terms?
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