Practice problem
What is the intersection of {1,2,3}\{1,2,3\}{1,2,3} and {4,5,6,7}\{4,5,6,7\}{4,5,6,7}?
{1,2,3,4,5,6,7}\{1,2,3,4,5,6,7\}{1,2,3,4,5,6,7}
1,2,3,4,5,6,71,2,3,4,5,6,71,2,3,4,5,6,7
{∅}\{\emptyset\}{∅}
{}\{\}{}
Type a concept, like “slope” or “photosynthesis”.
