[tex]\large{\begin{array}{l}\sf{m\cdot{d}\cdot{c}\,(8,16,20)=4}\\\\\begin{array}{r|l}\sf8,16,20&\sf2\\\sf4,8,10&\sf2\\\sf2,4,5&\overline{\sf2^2=4}\end{array}\end{array}}[/tex]
