diff --git a/euler15.php b/euler15.php
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--- /dev/null
+++ b/euler15.php
@@ -0,0 +1,7 @@
+<?php
+/*
+* Gnieark's anwser to euler problem 15
+* https://projecteuler.net/problem=15
+*/
+
+echo gmp_fact(2*20)/pow(gmp_fact(20),2);
\ No newline at end of file