1.

Prove that A-B' = AnB if A and B are any two sets.​

Answer»

Answer:

A- B means EVERYTHING in A except for anything in A\cap BA∩B

Let X is an arbitrary ELEMENT of A - B

it means , X\in A-BX∈A−B

\implies x\in A⟹x∈A and x\notin Bx∈

/

B

\implies x\in A⟹x∈A and x\in B'x∈B

\implies x\in A\cap B'⟹x∈A∩B

\implies A-B=A\cap B'⟹A−B=A∩B

SIMILARLY, Let y is an arbitrary element of A\cap B'A∩B

then, y\in A\cap B'y∈A∩B

\implies y\in A⟹y∈A and y\in B'y∈B

\implies y\in A⟹y∈A and y\notin By∈

/

B

\implies y\in A-B⟹y∈A−B

\implies A\cap B'=A-B⟹A∩B

=A−B

hence proved//



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