Q. 12 B3.8( 5 Votes )

For any two sets

Answer :

We have B’ A’

To Show: A B

Let, x ϵ A

x A’ [ A A’ = ϕ ]

x B’ [ B’ A’ ]

x ϵ B [ B B’ = ϕ]

Thus, x ϵ A x ϵ B

This is true for all x ϵ A

A B.

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