(Q14).If A = {4, 5, 6}; B = {7, 8}, then show that A ∪ B = B ∪ A.

Given sets are

A = {4, 5, 6} and B = {7, 8}

A ∪ B = {4, 5, 6} ∪ {7, 8}

= {, , , , }.

B ∪ A = {7, 8} ∪ {4, 5, 6}

= {, , , , }

∴ A ∪ = B ∪ .