Let E be the event that the life of a certain light bulb is at least 350 hours and F that the life is at most 450 hours. Describe the fo (a) En F O none of these O The light bulb lasts at least 350 hours and the light bulb lasts at most 450 hours. O The light bulb lasts at least 350 hours or the light bulb lasts at most 450 hours. (b) FC The light bulb does not last at least 350 hours. The light bulb does not last at most 450 hours. O The light bulb lasts at most 450 hours. none of these O The light bulb lasts at least 350 hours. (C) EC UF O none of these O The light bulb lasts at least 350 hours or the light bulb lasts at most 450 hours. The light bulb does not last at least 350 hours or the light bulb lasts at most 450 hours. The light bulb does not last at least 350 hours and the light bulb lasts at most 450 hours.

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