Find L.C.M. of the following numbers by prime factorisation method: $12, 15, 20$

Find L.C.M. of the following numbers by prime factorisation method: $21, 28, 36$

Find L.C.M. of the following numbers by prime factorisation method: $16, 20, 40$

Find L.C.M. of the following numbers by prime factorisation method: $84, 90, 120$

Find L.C.M. of the following numbers by prime factorisation method: $14, 24, 48$

Find L.C.M. of the following numbers by prime factorisation method: $9, 12, 24$

Find L.C.M. of the following numbers by prime factorisation method: $24, 48, 80$

Find L.C.M. of the following numbers by prime factorisation method: $121, 1331$

Find L.C.M. of the following numbers by prime factorisation method: $42, 56, 132$