X = {5, 1, 2, 8}. 4 .
1. 5, 1, 2, 8, ?
. ððð , .
( ) , . : ( ´ ´ ) = 4 4 4 =
= 43 = 64.
1 4 3 .
. k, X, k. .
, , :
.
2.
5, 1, 2, 8, ?
. ððð , .
, ( ), .
4 3 2 = 24.
2 4 3 .
. k - , X, k. .
, , :
.
3. 5, 1, 2, 8, ?
. ðððð , . ( ) . . ( ) , , .
: 4 3 2 1 = 24.
3 4 .
. m , , , . .
, , : = ( 1) ( 2) ... 1 = !
! m - 1 ( 1).
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4. , , X = {5, 1, 2, 8}?
. : {5, 1, 2}, {5, 1, 8}, {1, 2, 8}, {5, 2, 8}. 4. .
. k , m - X, k. .
m . , k - m - .
, k , k! . ,
= k!
: .
3.
, k X, , .. k, , X. .
1. .
, .
. X . k X , ( k). X X. ( k) X k . , k ( k) , . .
2. k, , 1£ k £ 1,
.
. :
,
.
.
- . X . , , . k X : , , , . k k \ { } = '. X' 1, k . k . . , (k 1) , X'. ,
(k 1) ', .. .
k , , , . , , k X . . , .
, . , [3].
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. | . | . | . | . | . | . | . | . | . | . |
( = 0, 1, 2 ) . , . , , . . , 10 4 6, 10.