Question

prove that if A,B,C are three sets such the A subset B and B subset C the A subset c​

Answer 1

Let x∈C−B.

Then,

x∈C−B⇒x∈C

x



∈B⇒x∈C

x



∈A⇒x∈C−A [∵A⊂B]

∴C−B⊂C−A.

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Answer 2

I am not confame to correct ans A