Предмет: Математика, автор: qwertybang40

Из колоды карт (36 штук) выбирают карты по одной, пока не будет выбрана карта красной масти. Какова вероятность того, что придется выбрать более трех карт?

Ответы

Автор ответа: PainfuI

выбирая первую карту, шансы на то, что выпадет красная будут 50%, так как в колоде 18 красных и 18 черных

выбирая вторую (если выпала все-таки черная), шансы на успех будут уже примерно 51.5%, так как в колоде 18 красных и 17 черных карт

выбирая третий (если нам опять не повезло), с вероятностью почти 53% мы вытянем красную

итак, выходит, что шанс на то, что мы вытянем первый раз черную - 50%, второй - 48.5% и третий - 47%

перемножив все значения получаем почти 11.4% и это значит, что шанс на то, что нам не повезет вытянуть красную карту за 3 хода составляют 11.4%

ответ: 11.4%

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