Question

find the lcm and hcf 12 14 17 28

Answer 1

LCM = 2 x 2 x 17 x 3 x 7 x 19 = 271312

I couldn't find any common factor

Answer 2

LCM -  

2 I 12,14, 17, 28

2  I 6, 7, 17, 14

3  I 3, 7, 17, 7

7  I 1, 7, 17, 7

17 I 1, 1, 17, 7

   I 1, 1, 1, 1

LCM = 2 × 2 × 3 × 7 × 17

LCM = 1428

HCF -

12 = 2 x 2 x 3

14 = 2 x 7

17 = 17

28 = 2 x 2 x 7

As there are no common factors,

HCF = 1

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