>> 10 .

17.

,

. X ||.

|| = 5, || = 5.

. , X 10 : | ∪ | = 10.

, . , X 5 , Y 4, 7. 5 4 9. . , X . : | ∪ Y| = || + |Y| - | ∩ Y|. -.

- , () , ().

:

| ∪ Y ∪ Z| = || + |Y| + |Z| - | ∩ Y| - | ∩ Z| - |Y ∩ Z| + | ∩ Y ∩ Z|.

:

| ∩ Y| = || + |Y| - | ∪ Y|;

| ∩ Y ∩ Z| = || + |Y| + |Z| - | ∪ Y| - | ∪ Z| - |Y ∪ Z| + | ∪ Y ∪ Z|.

100 . , . , . , 30 , 28, 42. 8 , 10, 5, . , , ?

S, L , . |S| = 30, |L| = 28 || = 42. |S ∩ L| = 8, | ∩ L| = 10, |S ∩ | = 5, |S ∩ L ∩ K| = 3.

S, L , - .

- :

|S ∪ L ∪ | = 30 + 28 + 42 - 8 - 10 - 5 + 3 = 80.

, 100 20 , , .

 

 

@Mail.ru