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DS: Probability

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DS: Probability

by ikaplan » Tue Sep 13, 2011 11:42 am
There are 300 people in a conference hall. Each person is either an engineer or a professor or both or only a journalist. What is the probability that a person randomly picked from the hall is a journalist?

(1) There are 200 people who are an engineer or a professor
(2) There are 200 people who are exclusively an engineer or a professor

OA is A

My reasoning:
Statement (1) states that E + P + EP= 200
Based on this, the probability of being a journalist can be calculated; so, statement (1) is sufficient

However, statement (2) says that E + P=200

My question:
Is this a typical GMAT question because, according to my reasoning, the statements collide.
"Commitment is more than just wishing for the right conditions. Commitment is working with what you have."
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by akhilsuhag » Tue Sep 13, 2011 12:00 pm
I haven't worked on the question. But on your other query, statements can't collide on the GMAT. Statements have to be true and compliment each other.
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by akhilsuhag » Tue Sep 13, 2011 12:02 pm
But in this case obviously A is sufficient.

Further, both statements together are giving that EP is 0.

They are not necessarily colliding!!
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by winniethepooh » Tue Sep 13, 2011 9:02 pm
ikaplan wrote:There are 300 people in a conference hall. Each person is either an engineer or a professor or both or only a journalist. What is the probability that a person randomly picked from the hall is a journalist?

(1) There are 200 people who are an engineer or a professor
(2) There are 200 people who are exclusively an engineer or a professor

OA is A

My reasoning:
Statement (1) states that E + P + EP= 200
Based on this, the probability of being a journalist can be calculated; so, statement (1) is sufficient

However, statement (2) says that E + P=200

My question:
Is this a typical GMAT question because, according to my reasoning, the statements collide.
Hi, what's the source?
Is there any explanation given with the OA, is yes please post!
thanks.
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by ikaplan » Tue Sep 13, 2011 11:24 pm
Source: NOVA's DS Prep Course, p.90

The explanation was in line with my reasoning.

akhilsuhag is right: I didn't consider that EP can be 0. In that case, both statements are true and compliment each other.
"Commitment is more than just wishing for the right conditions. Commitment is working with what you have."
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by mankey » Wed Sep 28, 2011 10:00 am
Some expert please respond on this one.

Thanks
Mankey
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