5.1. m a 1,, an n b 1,, bn m ∙ n (ai, bj), .
(a1, b1), (a1, b2), , (a1, bn), m∙n
(a2, b1), (a2, b2), , (a2, bn), m
...
(am, b1), (am, b2), , (am, bn).
n
5.2. 4 (, , , ), 9 13 , n=4∙9=36 , n=4∙13=52 .
5.3. n 1 a 1, a 2,, ,
n 2 b 1, b 2,, ,
..
nk k - x 1, x 2,, .
n 1 ∙ n 2 ∙∙ nk ( , ), .
5.4. : N = 62 = 36; N=63=216.
5.1 5.3 .
n { a 1, a 2,, an }. k (, , , ) n . :
1) ;
2) .
, . , .
5.5. , {1,2,3}. k =2 .
(1,1), (1,2), (1,3) (2,1), (2,2), (2,3) (3,1), (3,2), (3,3) | (1,1), (1,2), (1,3) (2,2), (2,3) (3,3) | |
(1,2), (1,3) (2,1), (2,3) (3,1), (3,2) | (1,2), (1,3) (2,3) | |
:
nk | ||
5.6. .
= .
5.7. 12- 3 . , .
Ω={(i 1, i 2, i 3) | i 1, i 2, i 3 {2,3,,12}},{ i 1 i 2, i 2 i 3 } . (Ω , n =113. k = = =9∙10∙11. ()= = = = .
5.8. k , . k Pk = k! (0!=1).
5.9. k - , n , n k .
|
|
n k
= ; k {0,1,, n }.
:
1) = =1;
2) = = n;
3) = ;
4) + = .