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Must Waste More Time...
Решение:Введем независимые события:
А1 = (при аварии сработает первый сигнализатор);
А2 = (при аварии сработает второй сигнализатор);
по условию задачи P(A1)=0,95, P(A2)=0,9.
Введем событие Х = (при аварии сработает только один сигнализатор). Это событие произойдет, если при аварии сработает первый сигнализатор и не сработает второй, или если при аварии сработает второй сигнализатор и не сработает первый, то есть
Тогда вероятность события Х по теоремам сложения и умножения вероятностей равна
ответ: 0,14.