Question

A = {1,2} B = {1,2,3} find the set A x B

Answer 1

Also, Find the cardinality of the set {5,{5},{5,5}}
I know with cardinality of the sets, you count the number of objects, but this one looks a bit different then what im used to. is it 4?

Answer 2

It's 3. The elements are: 5,{5},{5,5}

Answer 3

ahh thank you!

Answer 4

As for the first question, find the Cartesian product.

Answer 5

Im still stuck on the first one.