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From a group of 10 people, a committee of four people is to

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From a group of 10 people, a committee of four people is to  [#permalink]

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New post 20 Nov 2013, 02:12
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From a group of 10 people, a committee of four people is to randomly formed. Is the probability greater than 50% that the committee will contain more women than men?

(1) The group from which the committee is formed contains more women than men
(2) The ratio of women to men in the group from which the committee is formed is greater than or equal to 3:2
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Re: From a group of 10 people, a committee of four people is to  [#permalink]

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New post 20 Nov 2013, 02:42
6
5
From a group of 10 people, a committee of four people is to randomly formed. Is the probability greater than 50% that the committee will contain more women than men?

More women than men in 4-person committee means one of the following 2 cases:
WWWW
WWWM

(1) The group from which the committee is formed contains more women than men.

If there are 10 women in the group then the probability of getting more women will obviously be greater than 50% (100%). I
If there are 6 women and 4 men, then \(P(W>M)=\frac{C^4_6}{C^4_{10}}+\frac{C^3_6*C^1_4}{C^4_{10}}=\frac{15}{210}+\frac{20*4}{210}=\frac{95}{210}<\frac{1}{2}\).

Not sufficient.

(2) The ratio of women to men in the group from which the committee is formed is greater than or equal to 3:2 --> \(\frac{W}{M}\geq{\frac{3}{2}}\). We can get two different answers if we consider 9 women and 1 men and 6 women and 4 men. Not sufficient.

(1)+(2) Consider the same examples as above. Not sufficient.

Answer: E.
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Re: From a group of 10 people, a committee of four people is to  [#permalink]

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New post 20 Nov 2013, 02:45
2
1
Bunuel wrote:
From a group of 10 people, a committee of four people is to randomly formed. Is the probability greater than 50% that the committee will contain more women than men?

More women than men in 4-person committee means one of the following 2 cases:
WWWW
WWWM

(1) The group from which the committee is formed contains more women than men.

If there are 10 women in the group then the probability of getting more women will obviously be greater than 50% (100%). I
If there are 6 women and 4 men, then \(P(W>M)=\frac{C^4_6}{C^4_{10}}+\frac{C^3_6*C^1_4}{C^4_{10}}=\frac{15}{210}+\frac{20*4}{210}=\frac{95}{210}<\frac{1}{2}\).

Not sufficient.

(2) The ratio of women to men in the group from which the committee is formed is greater than or equal to 3:2 --> \(\frac{W}{M}\geq{\frac{3}{2}}\). We can get two different answers if we consider 9 women and 1 men and 6 women and 4 men. Not sufficient.

(1)+(2) Consider the same examples as above. Not sufficient.

Answer: E.


Similar questions to practice:
a-committee-consists-of-n-women-and-k-men-in-addition-there-127620.html (700+)
if-2-different-representatives-are-to-be-selected-at-random-128233.html (GMAT Prep 700)
a-committee-of-2-people-is-to-be-formed-from-a-group-of-108096.html (700)
a-certain-panel-is-to-be-composed-of-exactly-three-women-and-108964.html

Hope this helps.
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Re: From a group of 10 people, a committee of four people is to  [#permalink]

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New post 16 Jan 2014, 19:12
Bunuel wrote:
From a group of 10 people, a committee of four people is to randomly formed. Is the probability greater than 50% that the committee will contain more women than men?

More women than men in 4-person committee means one of the following 2 cases:
WWWW
WWWM

(1) The group from which the committee is formed contains more women than men.

If there are 10 women in the group then the probability of getting more women will obviously be greater than 50% (100%). I
If there are 6 women and 4 men, then \(P(W>M)=\frac{C^4_6}{C^4_{10}}+\frac{C^3_6*C^1_4}{C^4_{10}}=\frac{15}{210}+\frac{20*4}{210}=\frac{95}{210}<\frac{1}{2}\).

Not sufficient.

(2) The ratio of women to men in the group from which the committee is formed is greater than or equal to 3:2 --> \(\frac{W}{M}\geq{\frac{3}{2}}\). We can get two different answers if we consider 9 women and 1 men and 6 women and 4 men. Not sufficient.

(1)+(2) Consider the same examples as above. Not sufficient.

Answer: E.


Bunuel,

I am not clear that we you added 6C4 + 6C3x 4C1 in statement 1
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Re: From a group of 10 people, a committee of four people is to  [#permalink]

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New post 16 Jan 2014, 23:48
Mountain14 wrote:
Bunuel wrote:
From a group of 10 people, a committee of four people is to randomly formed. Is the probability greater than 50% that the committee will contain more women than men?

More women than men in 4-person committee means one of the following 2 cases:
WWWW
WWWM

(1) The group from which the committee is formed contains more women than men.

If there are 10 women in the group then the probability of getting more women will obviously be greater than 50% (100%). I
If there are 6 women and 4 men, then \(P(W>M)=\frac{C^4_6}{C^4_{10}}+\frac{C^3_6*C^1_4}{C^4_{10}}=\frac{15}{210}+\frac{20*4}{210}=\frac{95}{210}<\frac{1}{2}\).

Not sufficient.

(2) The ratio of women to men in the group from which the committee is formed is greater than or equal to 3:2 --> \(\frac{W}{M}\geq{\frac{3}{2}}\). We can get two different answers if we consider 9 women and 1 men and 6 women and 4 men. Not sufficient.

(1)+(2) Consider the same examples as above. Not sufficient.

Answer: E.


Bunuel,

I am not clear that we you added 6C4 + 6C3x 4C1 in statement 1


P(W>M) = P(WWWW) + P(WWWM).

If there are 6 women and 4 men, then, then \(P(WWWW)=\frac{C^4_6}{C^4_{10}}\) and \(P(WWWM)=\frac{C^3_6*C^1_4}{C^4_{10}}\).

Hope it's clear.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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From a group of 10 people, a committee of four people is to  [#permalink]

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New post 20 Nov 2017, 10:33
Bunuel wrote:
From a group of 10 people, a committee of four people is to randomly formed. Is the probability greater than 50% that the committee will contain more women than men?

More women than men in 4-person committee means one of the following 2 cases:
WWWW
WWWM

(1) The group from which the committee is formed contains more women than men.

If there are 10 women in the group then the probability of getting more women will obviously be greater than 50% (100%). I
If there are 6 women and 4 men, then \(P(W>M)=\frac{C^4_6}{C^4_{10}}+\frac{C^3_6*C^1_4}{C^4_{10}}=\frac{15}{210}+\frac{20*4}{210}=\frac{95}{210}<\frac{1}{2}\).

Not sufficient.

(2) The ratio of women to men in the group from which the committee is formed is greater than or equal to 3:2 --> \(\frac{W}{M}\geq{\frac{3}{2}}\). We can get two different answers if we consider 9 women and 1 men and 6 women and 4 men. Not sufficient.

(1)+(2) Consider the same examples as above. Not sufficient.

Answer: E.


Hi Bunuel,

I have one question, are n't both statements saying same thing ?

Statement 1: more women than men => w >= 6 and m <= 4 =>
if w = 6, m = 4, ratio w/m = 3/2
if w = 7, m = 3, ratio w/m = 7/3
ratio w/m >= 3/2

Statement 2: is exactly saying w/m >= 3/2

but answer is definitely (E) as we will get diff probabilities with cases w = 6, m = 4 and w = 7, m = 3 .....

Please clarify

Thanks
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Re: From a group of 10 people, a committee of four people is to  [#permalink]

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