<PRE><B>Question 433286</B>
In a box of thirty aaa batteries there are three defective batteries. 
Two batteries are randomly selected and tested. What is the probability that both are defective,
Ans: 3C2/30C2 = 3/(15*29) = 1/145
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If the first one is not replaced after being tested
Ans: 3/30 * 2/29 = 6/(30*29) = 1/145 

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Cheers,
Stan H.
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