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**jacks****Member**- Registered: 2012-11-21
- Posts: 126

There are 4 machine and it is known that exactly 2 of them are faulty.they are tested one by one in a random order

till both the faulty machine are identified.. Then the probability that only 2 tested are needed, is

plz explain using tree Diagram.

Thanks

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,657

hi

I have made the complete tree but left out some probabilities so you can practice completing the answers.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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