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Question Number 133818 by bramlexs22 last updated on 24/Feb/21
$$\mathrm{An}\:\mathrm{urn}\:\mathrm{contains}\:\mathrm{24}\:\mathrm{balls}\::\:\mathrm{6}\:\mathrm{white}\:,\:\mathrm{6}\:\mathrm{black},\: \\ $$$$\mathrm{6}\:\mathrm{green}\:,\:\mathrm{and}\:\mathrm{6}\:\mathrm{red}.\:\mathrm{If}\:\mathrm{4}\:\mathrm{balls}\: \\ $$$$\mathrm{are}\:\mathrm{drawn}\:\mathrm{at}\:\mathrm{random}\:\mathrm{with}\:\mathrm{replacement} \\ $$$$.\:\mathrm{What}\:\mathrm{is}\:\mathrm{the}\:\mathrm{probability}\:\mathrm{that} \\ $$$$\mathrm{at}\:\mathrm{least}\:\mathrm{3}\:\mathrm{different}\:\mathrm{colors}\:\mathrm{are}\: \\ $$$$\mathrm{represented}\:\mathrm{in}\:\mathrm{the}\:\mathrm{sample}\:? \\ $$