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In an IT company, there are a total of 110 employees including 50

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In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post Updated on: 21 May 2015, 19:29
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In an IT company, there are a total of 110 employees including 50 programmers. The number of male employees is 80, including 35 male programmers. How many employees must be selected to guaranty that we have 3 programmers of the same sex?
A. 10
B. 50
C. 55
D. 35
E. 65

Originally posted by yenh on 21 May 2015, 00:52.
Last edited by yenh on 21 May 2015, 19:29, edited 2 times in total.
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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post 21 May 2015, 11:19
5
2
RudeyboyZ wrote:
I don't think I understand the question, will you please help me understand the question better.
thanks and regards,

Rudey!


Hi RudeyboyZ,

The question tells us about a company where the employees are either programmers or non-programmers. We are asked to find the minimum no. of employees that needs to be picked to ensure that we have either 3 male programmers or 3 female programmers.

I am putting up a diagram to help you understand the question better:

Image

We are given in the question that there are 110 employees and 50 programmers. That would leave us with 60 non-programmers. Out of the 50 programmers we have 35 male programmers and the balance 15 as female programmers.

The question asks us the minimum no. of employees that must be selected to guaranty that we have 3 programmers of the same sex i.e. either 3 male programmers or 3 female programmers.

Since the question is asking to guaranty picking up of 3 programmers of same sex, that would mean we need to exhaust all the possibility of picking up the non-programmers and then start picking up the programmers.That can only be done if we pick all the non-programmers first and then start picking up the programmers.

So we can pick all the 60 non-programmers.

Since we are left with only programmers now, we can start picking them up. Picking up 3 programmers would not guaranty us 3 same sex programmers as there may be 2 male programmers and 1 female programmers. Similarly picking up 4 programmers may leave us with 2 male programmers and 2 female programmers.

Picking any one of the more programmers would give us 3 programmers of same sex. So we need to pick up a minimum of 60 + 4 + 1 = 65 employees to ensure that we have 3 programmers of the same sex.

Hope it's clear :)

Regards
Harsh
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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post 21 May 2015, 01:23
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You could pick 60 non-programmers, 2 male programmers, and 2 female programmers, and still not have 3 programmers of the same sex. But if you pick one more person, you must either pick a male or a female programmer, so the answer is 65.
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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post 21 May 2015, 01:33
Amazing explanation. Thanks for your expertise!
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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post 21 May 2015, 09:48
I don't think I understand the question, will you please help me understand the question better.
thanks and regards,

Rudey!
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WE: Sales (Hospitality and Tourism)
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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post 21 May 2015, 22:35
EgmatQuantExpert wrote:
RudeyboyZ wrote:
I don't think I understand the question, will you please help me understand the question better.
thanks and regards,

Rudey!


Hi RudeyboyZ,

The question tells us about a company where the employees are either programmers or non-programmers. We are asked to find the minimum no. of employees that needs to be picked to ensure that we have either 3 male programmers or 3 female programmers.

I am putting up a diagram to help you understand the question better:

Image

We are given in the question that there are 110 employees and 50 programmers. That would leave us with 60 non-programmers. Out of the 50 programmers we have 35 male programmers and the balance 15 as female programmers.

The question asks us the minimum no. of employees that must be selected to guaranty that we have 3 programmers of the same sex i.e. either 3 male programmers or 3 female programmers.

Since the question is asking to guaranty picking up of 3 programmers of same sex, that would mean we need to exhaust all the possibility of picking up the non-programmers and then start picking up the programmers.That can only be done if we pick all the non-programmers first and then start picking up the programmers.

So we can pick all the 60 non-programmers.

Since we are left with only programmers now, we can start picking them up. Picking up 3 programmers would not guaranty us 3 same sex programmers as there may be 2 male programmers and 1 female programmers. Similarly picking up 4 programmers may leave us with 2 male programmers and 2 female programmers.

Picking any one of the more programmers would give us 3 programmers of same sex. So we need to pick up a minimum of 60 + 4 + 1 = 65 employees to ensure that we have 3 programmers of the same sex.

Hope it's clear :)

Regards
Harsh


Dear Harsh,

Thank you for the explanation, it has really opened up my mind to understanding the logic behind questions like this.

Do we get questions like the one above on the gmat, if so, how many can one expect? and what is the difficulty level of these questions, assuming now that I know how to solve this, it looks easy.

Warm Regards,

Rudey!
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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post 22 May 2015, 02:54
1
RudeyboyZ wrote:
EgmatQuantExpert wrote:
RudeyboyZ wrote:
I don't think I understand the question, will you please help me understand the question better.
thanks and regards,

Rudey!


Hi RudeyboyZ,

The question tells us about a company where the employees are either programmers or non-programmers. We are asked to find the minimum no. of employees that needs to be picked to ensure that we have either 3 male programmers or 3 female programmers.

I am putting up a diagram to help you understand the question better:

Image

We are given in the question that there are 110 employees and 50 programmers. That would leave us with 60 non-programmers. Out of the 50 programmers we have 35 male programmers and the balance 15 as female programmers.

The question asks us the minimum no. of employees that must be selected to guaranty that we have 3 programmers of the same sex i.e. either 3 male programmers or 3 female programmers.

Since the question is asking to guaranty picking up of 3 programmers of same sex, that would mean we need to exhaust all the possibility of picking up the non-programmers and then start picking up the programmers.That can only be done if we pick all the non-programmers first and then start picking up the programmers.

So we can pick all the 60 non-programmers.

Since we are left with only programmers now, we can start picking them up. Picking up 3 programmers would not guaranty us 3 same sex programmers as there may be 2 male programmers and 1 female programmers. Similarly picking up 4 programmers may leave us with 2 male programmers and 2 female programmers.

Picking any one of the more programmers would give us 3 programmers of same sex. So we need to pick up a minimum of 60 + 4 + 1 = 65 employees to ensure that we have 3 programmers of the same sex.

Hope it's clear :)

Regards
Harsh


Dear Harsh,

Thank you for the explanation, it has really opened up my mind to understanding the logic behind questions like this.

Do we get questions like the one above on the gmat, if so, how many can one expect? and what is the difficulty level of these questions, assuming now that I know how to solve this, it looks easy.

Warm Regards,

Rudey!


Hi RudeyboyZ,

Questions such as these are expected on the GMAT. Around 10%-15% of the OG questions are based on such concepts and can be solved using the tree structure diagram. This question is at best of medium difficulty level. .

Questions where you have multiple data points which have a dependency among them, try to represent it pictorially. Pictorial representation helps in better visualization of the information given as well as the question asked.

You may also try out the following question for your practice:
http://gmatclub.com/forum/according-to-a-certain-estimation-the-total-number-of-black-cats-is-198573.html

Once you feel confident in solving such questions give an attempt on these 3 700+ level questions on sets
http://gmatclub.com/forum/the-e-gmat-sets-triad-3-exciting-sets-questions-198192.html

Hope this helps :)

Regards
Harsh
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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post 22 May 2015, 05:26
Dear Harsh,

Valuable information provided, my deepest thanks.

Warm Regards,

Rudraksh
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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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New post 22 May 2015, 05:40
yenh wrote:
In an IT company, there are a total of 110 employees including 50 programmers. The number of male employees is 80, including 35 male programmers. How many employees must be selected to guaranty that we have 3 programmers of the same sex?
A. 10
B. 50
C. 55
D. 35
E. 65


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Re: In an IT company, there are a total of 110 employees including 50  [#permalink]

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