Question

If $A=\{1,2,3,4\},B=\{3,4,5,6\},C=\{5,6,7,8\}$ and $D=\{7,8,9,10\}$; find
(i) $A\cup B$

(ii) $A\cup C$

(iii) $B\cup C$

(iv) $B\cup D$

(v) $A\cup B\cup C$

(vi) $A\cup B\cup D$

(vii) $B\cup C\cup D$

Answer 1

$A=\{1,2,3,4\},B=\{3,4,5,6\},C=\{5,6,7,8\}$ and $D=\{7,8,9,10\}$
(i) $A\cup B=\{1,2,3,4,5,6\}$
(ii) $A\cup C=\{1,2,3,4,5,6,7,8\}$
(iii) $B\cup C=\{3,4,5,6,7,8\}$
(iv) $B\cup D=\{3,4,5,6,7,8,9,10\}$
(v) $A\cup B\cup C=\{1,2,3,4,5,6,7,8\}$
(vi) $A\cup B\cup D=\{1,2,3,4,5,6,7,8,9,10\}$
(vii) $B\cup C\cup D=\{3,4,5,6,7,8,9,10\}$