From a group of seven girls and eight boys, how many : DS Archive
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From a group of seven girls and eight boys, how many

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Manager
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From a group of seven girls and eight boys, how many [#permalink]

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08 Aug 2003, 00:16
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From a group of seven girls and eight boys, how many committees of six each can be formed involving
a) three girls and three boys;
b) six girls or six boys;
c) at least five girls?
Manager
Joined: 24 Jun 2003
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Re: Counting methods # 13 [#permalink]

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08 Aug 2003, 08:31
Konstantin Lynov wrote:
From a group of seven girls and eight boys, how many committees of six each can be formed involving
a) three girls and three boys;
b) six girls or six boys;
c) at least five girls?

a) 7C6+8C6
b) 7C5*8C1 + 7C6*8C0
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08 Aug 2003, 08:50

A) 7C3 * 8C3
B) 7C6 + 8C6
C) (7C5 * 8C1) + 7C6
Manager
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09 Aug 2003, 04:10
mciatto wrote:

A) 7C3 * 8C3
B) 7C6 + 8C6
C) (7C5 * 8C1) + 7C6

You're right - I didn't see question (a) !!

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