There are 9 rats in a cage 3 of them ar one by one What is t

There are 9 rats in a cage, 3 of them ar one by one. What is the probability, that second rat wiII be marked, given first rat was marked. How this probability will changes, given first rat was not marked ? There are two boxes in stock First box contain 100 parts, 6 of them are defected Second box contain 200 parts, 15 of them are defected. Calculate probability to bring defected part from the stock. What is probability to bring two valid parts, given they are taken from the same box. How will the results change, if all parts are moved into one box

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