Assume now that there are 12 people initially on the yacht with 6 women and 6 men, and that exploration teams consist of six people. How many exploration teams have more women than men?

Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter19: Probabilistic Dynamic Programming
Section19.3: How To Maximize The Probability Of A Favorable Event Occurring
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Assume now that there are 12 people initially on the yacht with 6 women and 6 men, and that exploration teams consist of six people. How many exploration teams have more women than men?

Example 2.3.5: The Exploration Parties
Suppose there are 11 people aboard a yacht, 5 women and 6 men, and 4 of
them take the dinghy to explore an island. How many exploration parties have
at least two women?
A quick and dirty solution is this: choose 2 women from the 5 and then choose
2 others from the 9 remaining people. (This will certainly produce an exploration
party with 2 or more women.) Applying the product rule, we know that this can be
done in
(2) × (?)
= 10 × 36 = 360 ways.
// But is this correct?
// Does each "way" produce a unique exploration party?
That number cannot be right because the total number of possible exploration
parties is
(:)=
11 x 10 × 9 × 8 × 7!
4 x 3 × 2 × 1 × 7!
11!
= 11 x 10 x 3 = 330.
4! x 7!
For w = 0 to 4, the number of parties that contain exactly w women can be
counted by determining the number of ways w can be chosen from the 5 women,
and then choosing the rest of the party from the men; that is, (4 – w) men are
chosen from the 6 men.
(:)
6.
4 - W
4
1
15
15
1
3
5
20
100
2
10
15
150 |/ x 1
150
3
1
10
6.
60 |/ × 3
180
4
1
5 ||x 6
30
330
360
66
2 Sets, Sequences, and Counting
The correct answer is 150 + 60 + 5 = 215 parties contain at least 2 women.
// not 360
|| || |
I| || || ||||
х ххх хх
Transcribed Image Text:Example 2.3.5: The Exploration Parties Suppose there are 11 people aboard a yacht, 5 women and 6 men, and 4 of them take the dinghy to explore an island. How many exploration parties have at least two women? A quick and dirty solution is this: choose 2 women from the 5 and then choose 2 others from the 9 remaining people. (This will certainly produce an exploration party with 2 or more women.) Applying the product rule, we know that this can be done in (2) × (?) = 10 × 36 = 360 ways. // But is this correct? // Does each "way" produce a unique exploration party? That number cannot be right because the total number of possible exploration parties is (:)= 11 x 10 × 9 × 8 × 7! 4 x 3 × 2 × 1 × 7! 11! = 11 x 10 x 3 = 330. 4! x 7! For w = 0 to 4, the number of parties that contain exactly w women can be counted by determining the number of ways w can be chosen from the 5 women, and then choosing the rest of the party from the men; that is, (4 – w) men are chosen from the 6 men. (:) 6. 4 - W 4 1 15 15 1 3 5 20 100 2 10 15 150 |/ x 1 150 3 1 10 6. 60 |/ × 3 180 4 1 5 ||x 6 30 330 360 66 2 Sets, Sequences, and Counting The correct answer is 150 + 60 + 5 = 215 parties contain at least 2 women. // not 360 || || | I| || || |||| х ххх хх
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