12 Days of Christmas GMAT Competition - Day 2: The ancient Olympic

Explanation:
Options A and E nonsensically imply that Eratosthenes was responsible for Earth's axial tilt. Hence A and C are out.

Options B and D have parallelism error. Two entities separated by "and" should have parallel structure. In this case calculation of circumference of earth and (calculation) of Earth's axial tilt should be parallel. This is not the case in both option B and D. Hence out.

Option C has both the entities parallel (indicated by the usage of "of" after "and").

Hence ANSWER C.

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Answer should be D.
A&E can be eliminated for wrong parallelism (using for)
C has modifier error
Between B & D, the word usage is more suitable than "the use"

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for incorrect parallelism

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and --> change the meaning

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of -> wrong ( mentioned in a & B)

(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and --> correct one

(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for --> wrong

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for - Incorrect meaning issue
* who is known for his calculation of the circumference of the earth
* Who is known for his calculation for the earth's tilt - calculation of earth's tilt, not calculation for the earth's tilt

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and - Correct

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of - Incorrect Meaning Error modifier known for his calculation of the circumference of the earth is
(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation ofwrongly modifying library of alexandria

(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and
- Incorrect, present tense must be used while stating facts. Who was is known for his calculation of the circumference of the earth
the circumference of the Earth and for
Incorrect meaning issue
* who is known for his calculation of the circumference of the earth
* Who is known for his calculation for the earth's tilt - calculation of earth's tilt, not calculation for the earth's tilt

By comparing the options we can find the major difference is in the last word. We need to choose b/w {for,of,NA}

If we see the given sentence carefully there is a parallelism

who [color=#00a651]was chief librarian at the Library of Alexandria and
is known for his calculation of the circumference of the Earth and
for the Earth’s axial tilt as well as
for his introduction of the sieve of Eratosthenes


All other parallelisms are correct except known for his calculation of the circumference of the Earth and for the Earth’s axial tilt

Calculation of circumference and Calculation of axial tilt, by meaning. Hence need of instead of for.
[/color]


POE based on parallelism

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and Need of

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of

(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and Need of

(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for


IMO C

The ancient Olympic games were held every four years, a period of time known as an Olympiad; usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for the Earth’s axial tilt as well as for his introduction of the sieve of Eratosthenes, an ancient algorithm for finding prime numbers.

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for
And For wrong

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of

The bold face is wrong



(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and

Verb is missing in bold face

(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for

And for is wrong

Answer for this question is B

OA ) D

The ancient Olympic games were held every four years, a period of time known as an Olympiad; usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for the Earth’s axial tilt as well as for his introduction of the sieve of Eratosthenes, an ancient algorithm for finding prime numbers.

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for --> for put the Earth’s axial tilt in parallel to his calculation, which means Eratosthenes is known for the Earth's axial tilt which is illogical; also and put modifier 'who' and the verb 'is known' parallel which is wrong.

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and --> and put modifier 'who' and the verb 'is known' parallel which is wrong.

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of --> known is modifying Library of Alexandria rather than Eratosthenes which is not true

(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and --> and perfectly put both modifiers in parallel

(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for --> for put the Earth’s axial tilt in parallel to his calculation, which means Eratosthenes is known for the Earth's axial tilt which is illogical

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for
--> "usage" would be incorrect over here as it does not signify the act of using something.
"and for" is incorrect since the "calculation of" is the point of fanning of the clause and not "known for"

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and
--> no issues

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of
--> missed the main verb after the introduction of the "Eratosthenes". The structure refers to someone from the present day.

(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and
--> "usage" would be incorrect over here as it does not signify the act of using something.
"and known for" is incorrect since he continues to be known for it

(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for
--> "and for" is incorrect since the "calculation of" is the point of fanning of the clause and not "known for"

To find our answer, let us look for 4 incorrect options.

1. Option A and E convey the illogical meaning that Eratosthenes was known for the Earth's axial tilt hence these options are incorrect.

2. Option D conveys the meaning that Eratosthenes was known for his calculation of the circumference of the "Earth and Earth's axial tilt" as one entity which is incorrect.

3. Option C conveys the incorrect meaning that the Library of Alexandria is known for the calculation of the circumference of the earth which is incorrect.

Hence only option B is left and is our answer.

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of - CORRECT, we do not need parallelism here Also, 'who was the chief' is not used here, which makes it concise.

(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and

(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for

(A) The ancient Olympic games were held every four years, a period of time known as an Olympiad; usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for the Earth’s axial tilt as well as for his introduction of the sieve of Eratosthenes, an ancient algorithm for finding prime numbers. - Incorrect placement of modifier, Eliminate

(B) The ancient Olympic games were held every four years, a period of time known as an Olympiad; the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and the Earth’s axial tilt as well as for his introduction of the sieve of Eratosthenes, an ancient algorithm for finding prime numbers. - Correct placement of modifer, Correct

(C) The ancient Olympic games were held every four years, a period of time known as an Olympiad; the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of the Earth’s axial tilt as well as for his introduction of the sieve of Eratosthenes, an ancient algorithm for finding prime numbers. - Incorrect grammar, Eliminate

(D) The ancient Olympic games were held every four years, a period of time known as an Olympiad; usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and the Earth’s axial tilt as well as for his introduction of the sieve of Eratosthenes, an ancient algorithm for finding prime numbers. - 'is known' is required, Eliminate

(E) The ancient Olympic games were held every four years, a period of time known as an Olympiad; the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for the Earth’s axial tilt as well as for his introduction of the sieve of Eratosthenes, an ancient algorithm for finding prime numbers. - Incorrect placement of modifier, (should be calculation of Earth's axial tilt), Eliminate

Ans : B

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for - Parallelism issue - "his calculation" is required to be placed in the common stem part of the parallelism

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and - Parallelism issue - the tense in the modifier who was and who is not parallel

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of - Correct

(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and - Parallelism issue - the tense in the modifier who was and who is not parallel

(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for - Parallelism issue - same error as A "his calculation" is required to be placed in the common stem part of the parallelism

The ancient Olympic games were held every four years, a period of time known as an Olympiad; usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for the Earth’s axial tilt as well as for his introduction of the sieve of Eratosthenes, an ancient algorithm for finding prime numbers.

(A) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for

'use of' to be used in place of usage of

(B) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and

[color=#0000ff]'use of' is the correct structure..correct parallelism[/color]

(C) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, chief librarian at the Library of Alexandria, known for his calculation of the circumference of the Earth and of

incorrect parallelism in the end

(D) usage of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and known for his calculation of the circumference of the Earth and

'use of' to be used in place of usage of

(E) the use of an Olympiad as a unit of time in ancient histories is sometimes credited to Eratosthenes, who was chief librarian at the Library of Alexandria and is known for his calculation of the circumference of the Earth and for

incorrect parallelism in the end

IMO.. (B) is the answer