The GCF is 3.
The GCF is 6.
the HCF is 6
HCF is the highest common factor of two or more numbers. HCF of 12 and 54 is 6.
It is 6
3
hcf(10, 21) = 1 ⇒ 10 & 21 relatively prime hcf(12, 54) = 6 ⇒ 12 & 54 not relatively prime hcf(15, 27) = 3 ⇒ 15 & 27 not relatively prime hcf(21, 38) = 1 ⇒ 21 & 38 relatively prime
6
6
6
1
None. But 4 and 6 have a LCM (not LMC) of 12 and HCF of 2.