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# Three groups of children contain (i) 3 girls and 1 boy; (ii)

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Intern
Joined: 29 Aug 2003
Posts: 29

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Location: Mumbai
Three groups of children contain (i) 3 girls and 1 boy; (ii) [#permalink]

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10 Dec 2003, 06:17
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Three groups of children contain (i) 3 girls and 1 boy; (ii) 3 girls and 3 boys; (iii) 2 boys and 1 girl. One child is selected at random from each group. Find the probability that the three selected children comprise of 1 girl and 2 boys.

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Director
Joined: 13 Nov 2003
Posts: 788

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Location: BULGARIA

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10 Dec 2003, 06:35
1
KUDOS
1
This post was
BOOKMARKED
possible outcomes bbb,ggg,bgg,bbg, the prob of having bgg is 1/4

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SVP
Joined: 03 Feb 2003
Posts: 1603

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10 Dec 2003, 06:47
such q-s will never appear on the real test.

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Intern
Joined: 29 Aug 2003
Posts: 29

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10 Dec 2003, 06:51
Then what kinda questions can we expect on the real test??

Gaurav.

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SVP
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10 Dec 2003, 07:30
basic probability, no more
this question requires applying a full probability formula.

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Director
Joined: 28 Oct 2003
Posts: 501

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10 Dec 2003, 08:13
stolyar wrote: such q-s will never appear on the real test.

It's not a terribly difficult question, however.

GROUP 1: P OF GIRL .75
GROUP 2: P OF GIRL .50
GROUP 3: P OF GIRL .33 (APPX)

GBB: .75*.5*.67 .25125
BGB: .25*.5*.67 .08375
BBG: .25*.5*.33 .04125
---------
.37625

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Director
Joined: 13 Nov 2003
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Location: Florida

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12 Dec 2003, 20:00
stolyar wrote:
basic probability, no more
this question requires applying a full probability formula.

agreed..
BBG=1/4.3/6.1/3
BGB=1/4.3/6.2/3
GBB=3/4.3/6.2/3

prob. = 3/8

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GMAT Club Legend
Joined: 09 Sep 2013
Posts: 16605

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Re: Three groups of children contain (i) 3 girls and 1 boy; (ii) [#permalink]

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23 Sep 2017, 23:23
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Three groups of children contain (i) 3 girls and 1 boy; (ii)   [#permalink] 23 Sep 2017, 23:23
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