Search Problems   RSS Feed
projecteuler.net

Lattice Paths

 Published on Friday, 19th April 2002, 06:00 pm; Solved by 196249;
Difficulty rating: 5%

Problem 15

Starting in the top left corner of a $2 \times 2$ 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 $20 \times 20$ grid?