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# A committee of 4 boys and 3 girls is to be formed by lots

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Intern
Joined: 29 Aug 2003
Posts: 29

Kudos [?]: 1 [0], given: 0

Location: Mumbai
A committee of 4 boys and 3 girls is to be formed by lots [#permalink]

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10 Dec 2003, 06:16
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A committee of 4 boys and 3 girls is to be formed by lots from 8 boys and 5 girls. One of the boys is brother of one of the girls. Find the probability that both are included in the committee.

Kudos [?]: 1 [0], given: 0

Director
Joined: 13 Nov 2003
Posts: 788

Kudos [?]: 64 [0], given: 0

Location: BULGARIA

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10 Dec 2003, 06:47
7C3*4C2/8C4*5C3=3/10...

Kudos [?]: 64 [0], given: 0

Senior Manager
Joined: 23 Sep 2003
Posts: 292

Kudos [?]: 4 [0], given: 0

Location: US

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10 Dec 2003, 07:32
Why 4C2 when you say 7C3*4C2?

I can understand 7C3 for selecting the brother but why don't you multiply this by 2C1 (ways of selecting the remaining 2 girls after you select the sister)?

Kudos [?]: 4 [0], given: 0

Senior Manager
Joined: 23 Sep 2003
Posts: 292

Kudos [?]: 4 [0], given: 0

Location: US

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10 Dec 2003, 13:31
I'm so dumb. Finally got it.

It's funny how your brain shuts down when it comes to basic stuff.

No wonder the GMAT constantly devours.

Kudos [?]: 4 [0], given: 0

CEO
Joined: 15 Aug 2003
Posts: 3452

Kudos [?]: 924 [0], given: 781

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13 Dec 2003, 01:39
4128851 wrote:
A committee of 4 boys and 3 girls is to be formed by lots from 8 boys and 5 girls. One of the boys is brother of one of the girls. Find the probability that both are included in the committee.

so..we say 2 are already selected.

remaining... select 3 boys and 2 girls from 7 boys and 5 girls

ways to select = 7C3 * 4C2 = 210

total ways to select the people = 8C4 * 5C3 = 700

PROB = 210 /700 = 3/10

Kudos [?]: 924 [0], given: 781

Re: Probability!!!   [#permalink] 13 Dec 2003, 01:39
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# A committee of 4 boys and 3 girls is to be formed by lots

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