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24 April, 04:00

A room has three lightbulbs. each one has a 10% probability of burning out within the month. what is the probability that all three will be lit at the end of the month?

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  1. 24 April, 06:59
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    10% chance of burning out

    100-10 = 90% chance of not burning out

    90% = 0.9

    3 lightbulbs

    0.9^3 = 0.729 = 72.9%

    The probability that all 3 lightbulbs stay lit by the end of the month is 72.9%
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