Q. 6 B4.7( 13 Votes )

# For three sets A,

Given: A B

To show: C–B C–A

Let x ϵ C– B

x ϵ C and x B [by definition C–B]

x ϵ C and x A

x ϵ C–A

Thus x ϵ C–B x ϵ C–A. This is true for all x ϵ C–B.

C – B C – A.

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