Solution to problem 15 in Julia

src/Julia/Problem015.jl

@@ -0,0 +1,28 @@
+using Base: Integer
+#=
+Created on 25 Jul 2021
+
+@author: David Doblas Jiménez
+@email: daviddoji@pm.me
+
+Solution for Problem 15 of Project Euler
+https://projecteuler.net/problem=15
+=#
+
+function Problem15()
+    #=
+    Starting in the top left corner of a 2×2 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 20×20 grid?
+    =#
+    n = 20
+    return Integer(factorial(big(2n)) / (factorial(big(n)) * factorial(big(2n - n))))
+end
+
+
+println("Time to evaluate Problem 15:")
+@time Problem15()
+println("")
+println("Result for Problem 15: ", Problem15())