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In an IT company, there are a total of 110 employees including 50
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Updated on: 21 May 2015, 18:29
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76% (02:25) correct 24% (02:31) wrong based on 203 sessions
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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
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:
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.
Re: In an IT company, there are a total of 110 employees including 50
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21 May 2015, 00:23
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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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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:
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.
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:
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.
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.
Re: In an IT company, there are a total of 110 employees including 50
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22 May 2015, 04:40
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
Re: In an IT company, there are a total of 110 employees including 50
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11 Mar 2018, 22:10
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76% (02:25) correct 
