I know the sideways U means "is a subset of" and if there is a line under it, it means "is equal to"

Question

I have two sets:

{-3,0,3} _____ {-3,-1,1,3}

choose the correct symbol
a. sideways U with line under it and slash through it
b. sideways U with line under it but no slash at all

-3, and 3 are subsets, but 0 is not in the other set... would that make the answer b?

please, help?

thank you!

Answer 1

As you said, 0 is not in the second set,
So, the answer is (a): NOT a subset