Respuesta :

[tex]9|3\\3|3\\1|\\9=\fbox3\cdot3\\\\15|3\\.\ 5|5\\.\ 1\\15=\fbox3\cdot5\\\\63|3\\21|3\\.\ 7|7\\.\ 1|\\63=\fbox3\cdot3\cdot7\\\\\huge\boxed{GCF(9;\ 15;\ 63)=\fbox3}[/tex]
The greatest common factor of 9,15 and 63 is 3