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An urn has 6 balls that are identical except that 3 are white and 3 are...

An urn has 6 balls that are identical except that 3 are white and 3 are red. A sample of 4 is selected randomly without replacement. A) What is the probability that exactly 2 are white and 2 are red? B) What is the probability that at least 2 of the balls are white?

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Answer #1

We can convert this problem in to binomial distribution

Probability of selecting white ball is

Let

Number balls selected ( which is same as a sample of 4 is selected randomly without replacement )

A)  The probability that exactly 2 are white and 2 are red is

B) The probability that at least 2 of the balls are white is

  

  

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