The HCF of three numbers 72, 108 and 210 is:

18 6 12 5

6

72 = 2 x 2 x 2 x 3 x 3 108 = 2 x 2 x 3 x 3 x 3 210 = 2 x 3 x 5 x 7 So , HCF of three numbers 72, 108 and 210 = 2 x 3 = 6