Question

(A-B)-C ⊆ A-C draw venn diagrams for each expression

Answer 1

don't really get what ⊆ means

Answer 2

it's a subset sign

Answer 3

how about ∈ then? what's the difference

Answer 4

\[A=\{1,2,3,4\}\]
\[B=\{2\}\]
\[B\subseteq A\]
because 2 is in A too

Answer 5

I think they are same but not absolutely sure

Answer 6

Oh I see so in this question is it saying that the stuff in (A-B)-C is also in A-C

Answer 7

yep

Answer 8

\[\in\] means element of

so \[2\in\{1,2,3\}\]

and

\[\{2\}\subseteq\{1,2,3\}\]