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Project Euler #453 confusion

So I decided to give a shot on the #453 project euler problem but there is something that confuses me with the numbers given. I decided to start by calculating the possible arrangements of 4 vertices ...
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How many routes are there through from top left corner to top right in a 20x20 grid? Binomial Coefficent explanation [duplicate]

Possible Duplicate: Counting number of moves on a grid I'm trying to solve this computer programming problem on Project Euler: http://projecteuler.net/index.php?section=problems&id=15 ...