Each other Vs One another:
Each other for two things/Persons:
Democrats and Republicans Monday blamed each other for New Jersey's failure. [nytimes.com]
Considering NYT and CNET run each others' news on their sites, they clearly didn't consider each other competitors when the NYT subscription model was still in place. [nytimes.com]
The four California teams (U.C.L.A., U.S.C., California and Stanford) will play each other every season, a concession that was important for those programs. [One team will play with another team--so, two teams]
Those two meanings collide, overlap, and otherwise play off each other.
Each other for more than two people/things:
Soundcloud has quickly become a central site in the online culture of musicians making their music freely available to each other and to supportive listeners.
GMATPREP has the use of "each other" for two things/persons in the right option:
It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
(E) are caused by the interaction of two stars orbiting each other
GMATPREP has used One another for more than two:
The Kwakiutl recognized one social unit larger than the tribe--the confederacy, which was a cluster of loosely knit, informally related neighboring tribes who interacted with themselves more often than between other tribes.
(C) tribes who interacted with one another more often than with
GMATPREP Conclusion:
Since GMATPREP has used "each other" for two things and "one another" for more than two things, we can use it as the basis of elimination only when we are stuck between two options. I think there will be other errors in the wrong options. We cannot conclude, specially in the GMAT land, that "each other" and "one another" rule is not valid. Dictionary reference is not enough in case of GMAT.
OG10:
It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
(A) may be caused by the interaction where two stars orbit each other
(B) may be caused by the interaction between two stars that each orbit the other
(C) are because of the interaction between two stars that orbit each other
(D) are caused by the interaction of two stars where each is orbiting the other
(E) are caused by the interaction of two stars orbiting each other
Choice E, the best answer, avoids redundancy by using are rather than may be, employs the idiomatic phrase the inter¬action of, and expresses the relationship between the stars in a clear, concise way--two stars orbiting each other. In A and B, the use of may be is redundant because the beginning phrase It seems likely that has already established a degree of uncertainty. In A, the phrase the interaction where two stars orbit each other is imprecise and illogical, suggesting that the interaction is a place where the orbiting occurs. In B, the phrase two stars that each orbit the other is both awkward and needlessly wordy. Choice C can be faulted because to form a passive construction, are should take a verb form such as caused rather than an adverb such as because. Also, the phrase two stars that orbit each other illogically suggests that there are two particular stars causing all the phenomena in question, rather than various sets of stars in various loca-tions. In D, the word where has no clear or logical referent, and each is orbiting the other is awkward and unnecessarily wordy; it could be replaced by the clearer and more concise orbiting each other.
--> In the explanation of the official guide 10th edition, it has not been mentioned that "each other" is used for two things. There are other problems in the wrong answers.
GMAC has made its rule about sentence correction. We should follow what GMAC says. Since GMAC has used "each other" for two things and "one another" for more than two things, we cannot avoid this rule. We should abide by the rules created by GMAC because we are going to play in their field. Otherwise, we will be penalized.
OG12:
The diagonals of a parallelogram bisects each other. [Two diagonals.] [Page 131.]
Since it is given that x = y, set the expressions for x and y equal to each other and solve for t. [Page 200]
Note that two numbers are reciprocals of each other if and only if their product is equal to 1. [Page 256]
I did not find any example of "each other" in the sentence correction section of official guide 12th edition.
Thanks.
Each other for two things/Persons:
Democrats and Republicans Monday blamed each other for New Jersey's failure. [nytimes.com]
Considering NYT and CNET run each others' news on their sites, they clearly didn't consider each other competitors when the NYT subscription model was still in place. [nytimes.com]
The four California teams (U.C.L.A., U.S.C., California and Stanford) will play each other every season, a concession that was important for those programs. [One team will play with another team--so, two teams]
Those two meanings collide, overlap, and otherwise play off each other.
Each other for more than two people/things:
Soundcloud has quickly become a central site in the online culture of musicians making their music freely available to each other and to supportive listeners.
GMATPREP has the use of "each other" for two things/persons in the right option:
It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
(E) are caused by the interaction of two stars orbiting each other
GMATPREP has used One another for more than two:
The Kwakiutl recognized one social unit larger than the tribe--the confederacy, which was a cluster of loosely knit, informally related neighboring tribes who interacted with themselves more often than between other tribes.
(C) tribes who interacted with one another more often than with
GMATPREP Conclusion:
Since GMATPREP has used "each other" for two things and "one another" for more than two things, we can use it as the basis of elimination only when we are stuck between two options. I think there will be other errors in the wrong options. We cannot conclude, specially in the GMAT land, that "each other" and "one another" rule is not valid. Dictionary reference is not enough in case of GMAT.
OG10:
It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
(A) may be caused by the interaction where two stars orbit each other
(B) may be caused by the interaction between two stars that each orbit the other
(C) are because of the interaction between two stars that orbit each other
(D) are caused by the interaction of two stars where each is orbiting the other
(E) are caused by the interaction of two stars orbiting each other
Choice E, the best answer, avoids redundancy by using are rather than may be, employs the idiomatic phrase the inter¬action of, and expresses the relationship between the stars in a clear, concise way--two stars orbiting each other. In A and B, the use of may be is redundant because the beginning phrase It seems likely that has already established a degree of uncertainty. In A, the phrase the interaction where two stars orbit each other is imprecise and illogical, suggesting that the interaction is a place where the orbiting occurs. In B, the phrase two stars that each orbit the other is both awkward and needlessly wordy. Choice C can be faulted because to form a passive construction, are should take a verb form such as caused rather than an adverb such as because. Also, the phrase two stars that orbit each other illogically suggests that there are two particular stars causing all the phenomena in question, rather than various sets of stars in various loca-tions. In D, the word where has no clear or logical referent, and each is orbiting the other is awkward and unnecessarily wordy; it could be replaced by the clearer and more concise orbiting each other.
--> In the explanation of the official guide 10th edition, it has not been mentioned that "each other" is used for two things. There are other problems in the wrong answers.
GMAC has made its rule about sentence correction. We should follow what GMAC says. Since GMAC has used "each other" for two things and "one another" for more than two things, we cannot avoid this rule. We should abide by the rules created by GMAC because we are going to play in their field. Otherwise, we will be penalized.
OG12:
The diagonals of a parallelogram bisects each other. [Two diagonals.] [Page 131.]
Since it is given that x = y, set the expressions for x and y equal to each other and solve for t. [Page 200]
Note that two numbers are reciprocals of each other if and only if their product is equal to 1. [Page 256]
I did not find any example of "each other" in the sentence correction section of official guide 12th edition.
Thanks.
