Question
An urn contains 3 white and 5 black balls. One ball is draw. What is the probability that it is black?

None of these



easy
Solution
Hence,
.
SIMILAR QUESTIONS
There are four machines and it is know that exactly two of them are faulty. They are tested, one by one, in a random order till both the faulty machines are indentified. Then the probability that only two tests are needed is
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