.
W S ( ) - , - , , s ( ), S,
,
S s s, S S S.
10. , 12 13 . 10 . ?
x , y (12£ x £13, 12£ y £13).
(y ³ x), 0 £ y x £ 1/6 (10 . 1/6 ). (x ³ y), 0£ xy £1/6. , , s, . 8 , - .
p s . , s , . 6. : = 125/36 = 11/36.
2.5 .
.
A , (.. ),
P (A ()= P (A)+ P ().
A , A ( = ( \ )(,
, A \ .
:
P (A ()= P (A \ )+ P (). (2)
: A =(A \ )((A ∩ ), A \ A ∩ , :
P (A)= P (A \ )+ P (A ∩ ).
P (A \ ) (2). :
P (A ()= P (A)+ P () P (A ∩ ),
, ,
P (A + )= P (A)+ P () P (A×)
, A× = Æ:
P (A + )= P (A)+ P ().