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Statistika (za biologe, 2.dio) - Pmf

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⋄ (Broj kombinacija) Pretpostavimo da iz skupa od N elemenata i<strong>za</strong>biremo<br />

uzorak od njih r ne pazeći pri tom na poredak. To moˇzemo učiniti na<br />

N(N − 1) · · · (N − r + 1) N!<br />

=<br />

r!<br />

r!(N − r)! =<br />

� �<br />

N<br />

r<br />

načina. Taj broj zovemo broj kombinacija duljine r iz skupa od N<br />

elemenata.

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