divizorii lui 42 ={1,2,3,6,7,21,42} mltiplu de 21 =(21,42,.....21n} intersectia ={21,42}
mltiplu de 14 =(14,28,.....14n} mltiplu de 21 =(21,42,.....21n} 14=2*7 21=3*7 cmmmc=2*3*7=42 intersectia va fi multimea multiplilor lui 42 intersectia ={42,84...42n}
