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Roberta was born in 1967, and so in 1976 she was nine years old. It is

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Roberta was born in 1967, and so in 1976 she was nine years old. It is  [#permalink]

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New post Updated on: 03 Jun 2018, 09:17
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Roberta was born in 1967, and so in 1976 she was nine years old. It is clear from this example that the last two digits of a person’s birth year will be the same as the last two digits of the year of that person’s ninth birthday, except that the position of the digits will be reversed.

Which of the following is the best criticism of the assertions made?


A. The generalization is valid only for those birth years that do not end in two zeroes.

B. The example does not exhibit the same principle as is expressed in the generalization based on it.

C. The generalization is valid only for those birth years in which the last digit is one greater than the second-to-last digit.

D. The example cannot be shown to be correct unless the truth of the generalization is already presupposed.

E. The generalization is valid only for those birth years in which the last digit is greater than five.

Originally posted by AgarwalArpit20 on 03 Jun 2018, 07:27.
Last edited by Bunuel on 03 Jun 2018, 09:17, edited 1 time in total.
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Re: Roberta was born in 1967, and so in 1976 she was nine years old. It is  [#permalink]

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New post 03 Jun 2018, 07:55
aanyajain20 wrote:
Roberta was born in 1967, and so in 1976 she was nine years old. It is clear from this
example that the last two digits of a person’s birth year will be the same as the last two digits
of the year of that person’s ninth birthday, except that the position of the digits will be
reversed.
Which of the following is the best criticism of the assertions made?
A. The generalization is valid only for those birth years that do not end in two zeroes.
B. The example does not exhibit the same principle as is expressed in the generalization
based on it.
C. The generalization is valid only for those birth years in which the last digit is one greater
than the second-to-last digit.
D. The example cannot be shown to be correct unless the truth of the generalization is already
presupposed.
E. The generalization is valid only for those birth years in which the last digit is greater than
five.


Frankly speaking , I would have loved to have this in the DS Q..... :-(

Option A: Incorrect : This is correct but desnot contain the entire set of invalidity. [e.g., say the birthyear is 1988]

Option B: Incorrect : This is also partially correct. But the true principle is not specifically defined here .

Option C: Correct : Best of all the answers. [Can be tested with different birth years (failure cases): 1921, 1978, 2000 ,1999]

Option D: Incorrect : Again a very generalized statement ... similar issue as in B.

Option E: Incorrect : Similar issue as in A.
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Roberta was born in 1967, and so in 1976 she was nine years old. It is  [#permalink]

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New post 03 Jun 2018, 10:27
1
1
Roberta was born in 1967, and so in 1976 she was nine years old. It is clear from this example that the last two digits of a person’s birth year will be the same as the last two digits 3 of the year of that person’s ninth birthday, except that the position of the digits will be reversed.

Which of the following is the best criticism of the assertions made?


A. The generalization is valid only for those birth years that do not end in two zeroes.

B. The example does not exhibit the same principle as is expressed in the generalization based on it.

C. The generalization is valid only for those birth years in which the last digit is one greater than the second-to-last digit.

D. The example cannot be shown to be correct unless the truth of the generalization is already presupposed.

E. The generalization is valid only for those birth years in which the last digit is greater than five.
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Re: Roberta was born in 1967, and so in 1976 she was nine years old. It is  [#permalink]

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New post 03 Jun 2018, 22:48
1
Wow !! A great combination of Quant and Verbal So solve and evaluate each option. On doing so,

A. The generalization is valid only for those birth years that do not end in two zeroes.
- incorrect. eg. 1993 + 9 = 2002.

B. The example does not exhibit the same principle as is expressed in the generalization based on it. - incorrect.

C. The generalization is valid only for those birth years in which the last digit is one greater than the second-to-last digit. - plug in numbers and you find this to be right. Keep it.

D. The example cannot be shown to be correct unless the truth of the generalization is already presupposed. - incorrect.

E. The generalization is valid only for those birth years in which the last digit is greater than five. eg. 1934 + 9 = 1943. Hence, this option is proved wrong.

Thus, C is the only right choice.

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Roberta was born in 1967, and so in 1976 she was nine years old. It is  [#permalink]

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New post 06 Jun 2018, 08:09
Merged topic from earlier post
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Re: Roberta was born in 1967, and so in 1976 she was nine years old. It is  [#permalink]

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New post 25 Aug 2019, 11:39
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Roberta was born in 1967, and so in 1976 she was nine years old. It is   [#permalink] 25 Aug 2019, 11:39
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