Question

Fie multimea S={x e N I 2 mai mic sau egal cu x mai mic decat 21} Determinati multimile: A={x e S I x divide 2} B={x e S I 3 la x = 27} C={x e S I x este patrat perfect} D= { x e S I x este cub perfect}

Answer 1

S={2,3,4,5,6,7,8,9,10,11...20}
A={2,4,6,8,10,12,14,16,18,20}
B={3}
C={4,9,16}
D={8}