Um restaurante está com 13 pessoas: 9 clientes e 4 garçons. Se escolhermos uma pessoa do local aleatoriamente, qual a pr, a) 3/13, b) 9/13, c) 6/13, d) 7/13, Se você escolher aleatoriamente uma letra no alfabeto, qual a probabilidade de selecionar uma vogal?, ) 5/13, b) 7/13, c) 7/26, d) 5/26.

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