Answer to Question #269814 in Discrete Mathematics for auni

Question #269814

Let A and B be subsets of a universal set U. Show that A ⊆ B if and only if B ⊆ A.


1
Expert's answer
2021-11-22T17:38:21-0500

if A ⊆ B then A=ABA=A\cap B

if B ⊆ A then B=ABB=A\cap B

so, A=B=ABA=B=A\cap B


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