Question

Fie multimile A={n apartine N| 1\7<1\n<1\2} si B={n apartine N|3\2>5\n>2\3}. a) determinati elementele multimilor A si B. b)determinati A reunit cu B, A intersectat cu B, A-B, B-A.​
\=inseamna fractie

Answer 1

a) 1/7<1/n<1/2 =>  A={6,5,4,3}

3/2>5/n> 2/3 => 1,5>5/n>0,(6) => B={4,5,6,7}

b) A U B={3,4,5,6,7}

A ∩ B ={4,5,6}

A-B={3}

B-A={7}