Answer :

The numbers can be expressed as follows:

6 = 2 × 3

72 = 2 × 2 × 2 × 3 × 3

120 = 2 × 2 × 2 × 3 × 5

So for finding the HCF we may write as follows:

So HCF = 2 × 3

= 6

For finding the LCM we may write as follows:

So LCM = 2^{3} × 3^{2} × 5

= 360

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