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>> 8 .

1.3.

,

. ()

, , :

    1) C1 + 2 = 1, C1 2 = 0;
    2) 2 + 3 = 1, 2 3 = 0;
    3) 2 + 4 = 1, 2 4 = 0.

:

    (C1 + 2) (2 + 3) (3 + 4) = 1.

:

    (C1 2 + C1 3 + 2 2 + 2 3) (2 + 4) = 1.

C1 2 , , . , . 2 2. 0, :

    (C1 3 + 2 3) (2 + 4) = 1.

:

    1 3 2 + 1 3 4 + 2 3 2 + 2 3 4 = 1.

    C1 3 2 = 1

, 1 = 1, 3 = 1, 2 = 1. , , , . , .

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