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Difficulty:
75%
(hard)
Question Stats:
62% (01:37) correct
37% (01:33) wrong based on 8 sessions
History
Date
Time
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Not Attempted Yet
Of the 20 lightbulbs in a box, 2 are defective. An inspector will select 2 lightbulbs simultaneously and at random from the box. What is the probability that neither of the lightbulbs selected will be defective?
Give your answer as a fraction.
Give your answer as a fraction.
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Official Answer
153/190
03 Aug 2024, 05:06
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