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OpenStudy (anonymous):
In a group of 10 batteries, 3 are dead. You choose 2 batteries at random. I'm having trouble creating a probability model for the number of good batteries. I don't know how to find the probabilities shown in this model.
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OpenStudy (anonymous):
OpenStudy (tkhunny):
Can you make a tree? |dw:1415681722183:dw| Get us anywhere?
OpenStudy (anonymous):
Okay, I drew the tree, but I don't understand what to do next. Would I say that each branch is 1/2?
jimthompson5910 (jim_thompson5910):
Let's focus on this upper portion here |dw:1415682524382:dw|
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