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If three parts are selected at random from the bin, what is the probability that exactly two are defective? I am having trouble understanding the correct equation to use and then how to use it? Please explain step by step.

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The probability equation is P(event happening)=The number of ways even can occur/The total number of possible outcomes

In this case, the event is a defective part.

So here we have:

P (defective part)= number of ...