December 2018 1 18 Report
W urnie jest 3 kule czarne i 7 bialych. losujemy jedna kule a nastepenie z pozostalych kul losujemy jeszcze jedna kule oblicz prawdopodobienstwo ze w ten
sposob wyjmiemy kule w tym samym kolorze. pisze szybko i dlatego bez polsikch znakow.
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