Inference: Everyone who has graduated from

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ChessWriter: Senior | Next Rank: 100 Posts; Posts: 54; Joined: Sun Jan 01, 2012 4:24 am

by ChessWriter » Mon Mar 12, 2012 11:46 am

This is a question from one of the Manhattan GMAT practise tests

Everyone who has graduated from TopNotch High School has an intelligence quotient (IQ) of over 120. Most students with an IQ of over 120 and all students with an IQ of over 150 who apply to one or more Ivy League universities are accepted by at least one of them.

The statements above, if true, best support which of the following conclusions?
A. Every graduate of TopNotch High School with an IQ of 150 has been accepted by at least one Ivy-League university.
B. If a person is a high-school graduate and has an IQ of less than 100, he or she could not have been a student at TopNotch High School.
C. If a person has an IQ of 130 and is attending an Ivy-League university, it is possible for him or her to have graduated from TopNotch High School.
D. At least one graduate from TopNotch high school who has applied to at least one Ivy-League university has been accepted to one of them.
E. If a high-school graduate has an IQ of 150 and is not attending an Ivy-League university, then he or she did not apply to one of them.

Please guess your answer before you read below this line.

I answered D which is incorrect. The official answer is C.

Can anyone explain why D is incorrect?

Source: Beat The GMAT — Critical Reasoning | Mon Mar 12, 2012 11:46 am

vikram4689: Legendary Member; Posts: 1325; Joined: Sun Nov 01, 2009 6:24 amFollowed by: 14 members; Thanked: 105 times

by vikram4689 » Mon Mar 12, 2012 12:27 pm

D. At least one graduate from TopNotch high school who has applied to at least one Ivy-League university has been accepted to one of them.

Stimulus says Most students with an IQ of over 120 and all students with an IQ of over 150 who apply to one or more Ivy League universities are accepted by at least one of them. Consider a student having an IQ of 130 who applies to Ivy-League university. He may NOT be accepted because according to stimulus MOST of the students above 120 and ALL above 150 are accepted. Similarly if all students have IQ (>120 & <150),In this case D is NOT TRUE

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Thiagaraj: Junior | Next Rank: 30 Posts; Posts: 20; Joined: Tue Mar 06, 2012 9:26 am; Thanked: 2 times

by Thiagaraj » Fri Mar 16, 2012 9:51 am

Why is A incorrect? Doesn't it agree with what is there in the stimulus?

vikram4689: Legendary Member; Posts: 1325; Joined: Sun Nov 01, 2009 6:24 amFollowed by: 14 members; Thanked: 105 times

by vikram4689 » Fri Mar 16, 2012 10:03 am

You missed this from the stimulus: who apply to one or more Ivy League universities

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