Question

(a ∪ b) ∩ (a ∪ b') = a proof

Answer 1

let U= { 1,2,3,4}

a = { 1,2,3}

b = { 2, 3, 4}

(a U b ) = { 1,2,3,4}

b' = {1}

(a U b') = { 1, 2 , 3}

( a U b ) ∩ (a U b') = { 1,2,3} = a