Posted by Lori on Sunday, September 19, 2010 at 11:22pm.
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, if the first one is not replaced after being tested?

statistics  PsyDAG, Monday, September 20, 2010 at 11:16am
3/30 * 2/29 = ?
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