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Uma urna contém 4 bolas vermelhas e 6 bolas brancas. Retira-se…
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Uma urna contém 4 bolas vermelhas e 6 bolas brancas. Retira-se uma bola ao acaso e registra-se sua cor. Depois, a bola é reposta na urna. O experimento é repetido cinco vezes. Qual a probabilidade de tirar uma bola vermelha exatamente três vezes?
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