2 and 20 have an HCF of 2 and an LCM of 20. You could also use 4 and 10.
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No, 2 and 10 are factors of 20. The LCM of 2 and 10 is 10.
HCF of 3 means the numbers both have a prime factor of 3. LCM of 12 means that, between the numbers, there are factors of 2, 2 and 3. But these 2s cannot be shared, else the HCF would be greater. Therefore, the numbers will need to be 3 and 2x2x3, or 12.
1, 2.
30 & 1. 15 & 2. 10 & 3.
The greatest common factor of the numbers '420' and '2646' is '42'.