77 , 91 , 119 ║7 ⇒ mdc
11 , 13 , 17 ║
[tex]\begin{array}{c|c}\sf77,91,119&\boxed{\sf7}\\\sf11,13,17&\sf11\\\sf1,13,17&\sf13\\\sf1,1,17&\sf17\\\sf1,1,1\end{array}[/tex]
[tex]\boxed{\boxed{\sf m\cdot d\cdot c(77,91,119)=7}}[/tex]
