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Re: If you test 2 different lightbulbs from a box of 100 bulbs that contai [#permalink]
Bunuel wrote:
If you test 2 different lightbulbs from a box of 100 bulbs that contains 1 defective bulb what is the probability that both lightbulbs that you test are defective?

(A) 0
(B) 0.0001
(C) 1/9,900
(D) 0.01
(E) 1/99

From the highlighted parts it is clear that both Light bulbs can not be defective at the same time, thus answer must be (A) 0
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Re: If you test 2 different lightbulbs from a box of 100 bulbs that contai [#permalink]
Expert Reply
Bunuel wrote:
If you test 2 different lightbulbs from a box of 100 bulbs that contains 1 defective bulb what is the probability that both lightbulbs that you test are defective?

(A) 0
(B) 0.0001
(C) 1/9,900
(D) 0.01
(E) 1/99


Since there is only one defective bulb, the probability of testing two defective bulbs is zero.

Answer: A
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Re: If you test 2 different lightbulbs from a box of 100 bulbs that contai [#permalink]
Hello from the GMAT Club BumpBot!

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Re: If you test 2 different lightbulbs from a box of 100 bulbs that contai [#permalink]
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