Question

[COROANA]Calculați:A reunit B,A intersectat B,A\B,B\A,AxB,BxA știind că:
a)A={1,5,6,9,12}
B={3,5,7,9,15}​

Answer 1

A U B = [1,5,6,3,7,9,12,15]

A inter. B = [5,9]

A\B=[1,6,12]

B\A=[3,7,15]

AxB=

$\frac{1}{3 \:}$