Em uma festa para calouros estão presentes 250 calouros e 350 calouras. Para dançar, cada calouro escolhe uma caloura ao acaso formando um par. Per...

Para calcular a probabilidade de que uma determinada caloura não esteja dançando quando todos os 250 calouros estiverem dançando, podemos usar a fórmula da probabilidade condicional. A probabilidade de que uma determinada caloura não esteja dançando é igual ao número de maneiras que podemos escolher 250 calouros para dançar com 250 calouras, dividido pelo número total de maneiras que podemos escolher 250 calouros para dançar com qualquer uma das 350 calouras. Assim, a probabilidade de que uma determinada caloura não esteja dançando é: P = (350-1)C(250) / 350C(250) P = 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