Question

If A ⊂ B, then A ∩ B = A ∪ B.

Answer 1

seems unlikely, because if \(A\subset B\) then \(A\cap B=A\)

Answer 2

like it needs to be a sometimes always or never answer

Answer 3

i guess it would be true if \(A=B\) , untrue elsewise, so it depends on our definition of \(\subset\)

Answer 4

kay thanks

Answer 5

if \(A\subset B\) means "proper subset" then never
if it just means A is contained in B, then "sometimes"

Answer 6

cool your a life saver