Răspuns :
A={a,b,c}
B={a,b,d}
C={a,c,d}
(A∩B)-C={a,b}-C={b}
B={a,b,d}
C={a,c,d}
(A∩B)-C={a,b}-C={b}
A = {a; b ; c} ; B = {a; b , d } si C = {a; c ; d }
↓______________________↓ ↓
↓ ↓
A ∩ B = {a ; b} ↓
↓______________________↓
↓
( A ∩ B ) \ C = {a ; b} \ (a; c ; d} = { b }
↓______________________↓ ↓
↓ ↓
A ∩ B = {a ; b} ↓
↓______________________↓
↓
( A ∩ B ) \ C = {a ; b} \ (a; c ; d} = { b }