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(2/3)^2

(2/3)k
1/3
1

1

:
F (k) = (2/3)k; F (k) N ,
F (5) = 32/243 >1/10; f (6) = 64/729 < 1/10,
k , f (k) < 1/10 k = 6
: 6

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