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Friday, 15 may 2015

Urna cu zece bile

Proposed by GabiOffline
(4 comments)2.710 times displayed

Intr-o urna sunt doua bile albastre, trei bile negre, o bila roz si patru bile albe.

a) Care este probabilitatea ca la o extragere sa obtinem:
1) o bila albastra
2) o bila roz
3) o bila neagra
4) o bila alba

b) Care este probabilitatea ca la doua extrageri simultane sa obtinem :
1) doua bile de aceeasi culoare
2) una din bile sa fie roz

c) Care este probabilitatea ca la doua extrageri (prin punerea la loc a primei bile) sa se obtina:
1) doua bile de aceeasi culoare
2) una din bile sa fie roz
3) una din bile sa fie alba


Tags: problema zilei, probleme de matematica, amuzante, matematica amuzanta, urna, urne, bile
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