Let A be a subset of the set $\{ 1,2,3,4,5,6,7 \}$. $$A \cap \{ 5,6,7 \}$$ The elements of the set are odd numbers.\ Accordingly, how many three-element sets A satisfy this condition?\ A) 12\ B) 14\ C) 16\ D) 18\ E) 20
Let A be a subset of the set $\{ 1,2,3,4,5,6,7 \}$.
$$A \cap \{ 5,6,7 \}$$
The elements of the set are odd numbers.\
Accordingly, how many three-element sets A satisfy this condition?\
A) 12\
B) 14\
C) 16\
D) 18\
E) 20