Question

A={X∈NIX≤10;X:2} :DIVIDE        B={X∈N IX≤10;3:X}     C={X∈NIX≤20;X:4}              AUB     A∧B   B∧C  A∧B  CUA   BUC    (AUB)∧C    (AUФ)∧(BUФ)    (A∧Ф)U(CUФ)

Answer 1

A={2,4,6,8,10}
B={3,6,9}
C={4,8,12,16,20}
AUB={2,3,4,6,8,9,10}
Aintersectat B={{6}
Bintersectat C={4,8}
CUA={{2,4,6,8,10,12,16,20}
BUC={3,4,6,8,9,12,16,20}
(AUB)intersectat C={4,8}
AuФintersectatBuФ=Ф
(Aintesectat Ф)u(cUФ)=Ф