If sd V = 1, 2, 3, how many subsets does it have? 10) Find the HCF of 19 and 127.

The set $V = \{1, 2, 3\}$ has $n = 3$ elements.

The number of subsets of a set with $n$ elements is given by $2^n$.

The set $V$ has $\boxed{8}$ subsets.

127 is a prime number, so its only prime factor is itself.

The prime factors of 119 are 7 and 17.
The prime factor of 127 is 127.
There are no common prime factors other than 1.

When two numbers have no common prime factors other than 1, their Highest Common Factor (HCF) is 1.

The HCF of 119 and 127 is $\boxed{1}$.