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If two balls are randomly selected from a green urn contain

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Joined: 10 Sep 2013
Posts: 27
Location: India
Concentration: Accounting, Finance
GMAT Date: 10-25-2013
GPA: 3.66
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Kudos [?]: 6 [0], given: 30

If two balls are randomly selected from a green urn contain [#permalink] New post 19 Sep 2013, 22:08
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Question Stats:

84% (01:52) correct 15% (01:00) wrong based on 26 sessions
If two balls are randomly selected from a green urn containing 5 black and 5 white balls and placed into a yellow urn initially containing 5 black and 3 white balls. What is the probability that the yellow urn will contain an equal number of black and white balls after the change?

A.2/9
B.4/9
C.5/9
D.1/3
E.1/9



Can someone please answer this question..... :roll:
[Reveal] Spoiler: OA

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Re: If two balls are randomly selected from a green urn contain [#permalink] New post 19 Sep 2013, 23:13
Expert's post
KK23 wrote:
If two balls are randomly selected from a green urn containing 5 black and 5 white balls and placed into a yellow urn initially containing 5 black and 3 white balls. What is the probability that the yellow urn will contain an equal number of black and white balls after the change?

A.2/9
B.4/9
C.5/9
D.1/3
E.1/9



Can someone please answer this question..... :roll:


To have equal number of black and white balls, the yellow urn must have 5 black and 5 white balls. So the balls we select out of the green urn must be both white.
Probability (first ball is white) = 5/10
Probability(second ball is white) = 4/9
Probability (both balls are white) = (5/10)*(4/9) = 2/9
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Intern
Intern
User avatar
Joined: 10 Sep 2013
Posts: 27
Location: India
Concentration: Accounting, Finance
GMAT Date: 10-25-2013
GPA: 3.66
Followers: 0

Kudos [?]: 6 [0], given: 30

Re: If two balls are randomly selected from a green urn contain [#permalink] New post 20 Sep 2013, 01:21
Thanks karishma.... :)
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Strive for Excellence....!!!!!

Re: If two balls are randomly selected from a green urn contain   [#permalink] 20 Sep 2013, 01:21
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