. A, 1, 2, 3,... B n, ,
(1.7.1)
A AB 1, 2, 3,..., ABn,
=1+2+3++
i , (1.7.2)
. 1 2, , 1- 2 , 2-. = { }0,9, 0,7. = { }.
.
1 = { 1};
2 = { 2};
, , , ;
, , . . 83 100.
. . . 1/6 1/4. . = { }. :
= { };
1 = { }, (B1) = 0,5;
2 = { }, (B2) = 0,5;
/1 = {, , };
A/B2 = {, , }.
= { } ()∙(1/) = P(B1)∙(/1),
(*)
(*) () ,
(**)
(**) .
. , B1, 2, 3,..., , ; P (B1), (2) ,..., () . 1, B2, ..., , , . . P (Bi/A), i =1, 2,..., .
, ,
(1.7.3)
. (1.7.3) i, , . . .
. 1.8. , .
1. , 15 . , 80%. :
0 = { , , 0};
1 = { 1};
2 = { 2};
|
|
. . , ,
A 15 = { }.
, , , 15 12, ?
n , () = , .
.
. Pk,n , , , , k . :
= { i - } (i = l, 2, 3,..., n), P (Ai) = p;
= { i - } (i =1, 2, 3,..., ), P ()=1 p = g.
, k k , . . , A1A2A3...Ak ... An. , , ,
.
, k n k , k , .
[. (1.2.3)].
, k n -
(1.8.1)
. ; k , ( ); ; g - (g = 1 p); Pk,n , , k .
.
1. , . . n = 15, k = 12, p = 0,8, g = 1 0,8 = 0,2.
12 15 . , 12 15 25 100.