Mei claims: “If $n(A)=n(B)$, then $A=B$.” Give a counterexample using subsets of \[ \x

Question

Mei claims: “If $n(A)=n(B)$, then $A=B$.” Give a counterexample using subsets of $$ \xi=\{1,2,3,4\}. $$ For finite sets, is her claim true if $A\subseteq B$ is also known? Explain.

Accepted Answer

(a) Example: $A=\{1,2\}, B=\{3,4\}$ (b) Yes

Sets

Sets

Solution:

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