M (20) =0,20,40,60,80,100…
M(90)0,90,180,270,360,450,540..
M (15)=0,15,30,45,60,75,90…
MC =0.
MMC= (20,90,15)=
M(30)= 0,30,60,90,120,150…
M(48)= 0,48,96,144,192,240…
M(72)= 0,72,144,216,288,360…
MC=0
MMC (30,48,72)=0