Răspuns:
Explicație pas cu pas:
1.
A = {250; 252; 254; 256; 258}
B = {250; 255}
C = {250}
a) card A = 5; card B = 2; card C = 1
b)
A U B = {250; 252; 254; 255; 256; 258}
B ∩ C = {250}
A ∩ C = {250}
A U C = {250; 252; 254; 256; 258}
B U C = {250; 255}
B \ A = {255}
C \ A = ∅
B \ C = {255}
C \ B = ∅
A ∩ B ∩ C = {250}
__________________
2.
A = {54, 25, 56, 60, 83, 75, 94, 80, 32, 10, 55, 61, 87, 100}
B = {25, 60, 75, 80, 10, 55, 100}
C = {54, 56, 60, 94, 80, 32, 10, 100}
D = {60, 80, 10, 100}
E = {25, 75, 55}
F = {100}
G = {54, 56, 94, 32}
H = {83, 61, 87}