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.

Question

anonymous · Answer

attachment

tkhunny · Answer

Can you make a tree?

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Get us anywhere?

anonymous · Answer

Okay, I drew the tree, but I don't understand what to do next. Would I say that each branch is 1/2?

jim_thompson5910 · Answer

Let's focus on this upper portion here

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