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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 98<br />

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✫<br />

. . . Računanje z dogodki<br />

Produkt dogodkov A in B, označimo ga z A ∩ B ali AB, se zgodi, če se<br />

zgodita A in B hkrati.<br />

Primer: Produkt dogodka A, da vrˇzemo sodo ˇstevilo pik,<br />

in dogodka B, da vrˇzemo liho ˇstevilo pik, je nemogoč dogodek.<br />

Velja: A ∩ B = B ∩ A ; A ∩ N = N ; A ∩ G = A ; A ∩ A = A<br />

B ⊂ A ⇐⇒ A ∩ B = B ; A ∩ (B ∩ C ) = (A ∩ B) ∩ C<br />

A ∩ (B ∪ C ) = (A ∩ B) ∪ (A ∩ C ) ; A ∪ (B ∩ C ) = (A ∪ B) ∩ (A ∪ C )<br />

Dogodku A nasproten dogodek A imenujemo negacijo dogodka A.<br />

Primer: Nasproten dogodek dogodku, da vrˇzemo sodo ˇstevilo pik,<br />

je dogodek, da vrˇzemo liho ˇstevilo pik.<br />

Velja: A ∩ A = N ; A ∪ A = G ; N = G ; A = A<br />

A ∪ B = A ∩ B ; A ∩ B = A ∪ B<br />

Univerza v Ljubljani ▲<br />

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▲<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

▲<br />

✩<br />

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