Question

A={x|x apartine N*,x<9} ,B={x|x apartine N,x-nr.natural de o cifra},C={x|x apartine
N,1≤x<4}.Aflati: A inreuniuneB, A inreuniune C, A la intersectie C, B la intersectie C.













































x

Answer 1

A={1,2,3,4,5,6,7,8}

B={0,1,2,3,4,5,6,7,8,9}

C={1,2,3}

A INREUNIUNE  CU B={0,1,2,3,4,5,6,7,8,9}

A INREUNIUNE CU C={1,2,3,4,5,6,7,8}

A INTERSECTIE CU   C={1,2,3}

B INTERSECTIIE CU   C={1,2,3]