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Anonymous
The HCF is 28.
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It is: 28
4
196 = 2 x 2 x 7 x 7; 420 = 2 x 2 x 3 x 5 x 7. Common factors 2 x 2 x 7 ie 28 is the HCF.
196, 392, 588 and so on.
The LCM is: 196