Question

Se A={2,3,4,5}; B={0,2,4,6,8} ; E={1,2,3,4,5,6,7} calcule:

A) A-B=
B) E-A=
C) ( E-B) inter. ( A u B)=
D) ( A u B ) - ( A inter. E )=

Answer 1

A={2,3,4,5};
B={0,2,4,6,8} ;
E={1,2,3,4,5,6,7}

a) {2,3,4,5} - {0,2,4,6,8} = {3,5}

b) {1,2,3,4,5,6,7} - {2,3,4,5} = {1,6,7}

c) {1,2,3,4,5,6,7} - {0,2,4,6,8} = {1,3,5,7}
{2,3,4,5} U {0,2,4,6,8} = {0,2,3,4,5,6,8}
{1,3,5,7} inter. {0,2,3,4,5,6,8} = {3,5}

d) {2,3,4,5} U {0,2,4,6,8} = {0,2,3,4,5,6,8}
{2,3,4,5} inter. {1,2,3,4,5,6,7} = {2,3,4,5}
{0,2,3,4,5,6,8} - {2,3,4,5} = {0,6,8}