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An urn contains 10 red and 12 blue balls. They are withdrawn one at a time...

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Basic Math

An urn contains 10 red and 12 blue balls. They are withdrawn oneat a time without replacement until a total of 4 red balls havebeen withdrawn. Find the probability that exactly 7 ballswithdrawn/

Answer & Explanation Solved by verified expert
4.3 Ratings (594 Votes)
The R shows the red ball and B shows the blue ball Since weneed to draw 7 balls such that last ball is red and out of first 6balls 3 are also redOut of    See Answer
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