Question

minimo comun multiplo de 12,21,5

Answer 1

m.c.m. (12, 21, 5)  =  2² * 3 * 7 * 5  =  420

Answer 2

12-21-5  l 2
  6-21-5  l 2
  3-21-5  l 3
  1- 7 -5  l 5
  1- 7-1   l 7
  1 -1 -1

mcm = 2x2x3x5x7 = 420