Deprecated: urlencode(): Passing null to parameter #1 ($string) of type string is deprecated in /www/wwwroot/test.zuweb.solutions/index.php on line 2
Deprecated: sha1(): Passing null to parameter #1 ($string) of type string is deprecated in /www/wwwroot/test.zuweb.solutions/index.php on line 2 本A-41 19 ⑧ I saw this puzzle today and could not solve it : r/maths