Question

considere os conjuntos: A{1,2,5} , B= { 1,3}, C={5,6,7,8}

A) B ∩ ( A u B )

B) ( A ∩ B ) u (B ∩ C )

C) ( C u B ) ∩ ( A u B )








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Answer 1

a) A U B = {1, 2, 3, 5}

B ∩ ( A U B ) = {1, 3} ∩ {1, 2, 3, 5} = {1, 3}

b) A ∩ B = {1}

B ∩ C = ∅

( A ∩ B ) U (B ∩ C ) = {1}

c) C U B = {1, 3, 5, 6, 7, 8}

A U B = {1, 2, 3, 5}

( C U B ) ∩ ( A U B ) = {1, 3, 5}