SOLUTION: Thanks to whoever takes the time to answer!
An urn contains five red balls, seven black balls, and three green balls. If two balls are selected at random without replacement fro
Algebra.Com
Question 959063: Thanks to whoever takes the time to answer!
An urn contains five red balls, seven black balls, and three green balls. If two balls are selected at random without replacement from the urn, what is the probability that a red ball and a black ball will be selected? (Round your answer to three decimal places.)
My first answer of .167 was incorrect.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Thanks to whoever takes the time to answer!
An urn contains five red balls, seven black balls, and three green balls. If two balls are selected at random without replacement from the urn, what is the probability that a red ball and a black ball will be selected? (Round your answer to three decimal places.)
----
# of black/red pairs:: 7*5 = 35
# of random pairs:: 15C2 = 105
----
P(red/black) = 35/105 = 1/3
-----------------------------------
Cheers,
Stan H.
RELATED QUESTIONS
An urn contains seven red balls, four black balls, and six green balls. If two balls are... (answered by nerdybill)
An urn contains green balls and red balls. If Tim chooses balls at random from the... (answered by stanbon)
Two balls are drawn (without replacement) from an urn that contains four balls, five... (answered by Nate)
Two urns each contain green balls and black balls. Urn 1 contains four green balls and... (answered by Simnepi)
Urn 1 contains 6 red balls and 5 black balls. Urn 2 contains 3 red balls and 3 black... (answered by Boreal)
An urn contains yellow balls and red balls. If Frank chooses balls at random from the... (answered by lynnlo)
An urn contains red balls and white balls. If Tim chooses balls at random from the... (answered by jim_thompson5910,greenestamps)
Urn A contains five white balls and three black balls. Urn B contains seven white balls... (answered by ikleyn)
Two urns each contain green balls and blue balls. Urn I contains five green balls and two (answered by stanbon)