When should I use each other and when should I use one another?
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This is an interesting usage note extracted from the "each other" page of Yahoo! Education (emphasis added). It answers your question.
Each other refers to two, one another to more than two. "Jones and Smith quarreled; they struck each other" is correct. "Jones, Smith and Brown quarreled; they struck one another" is also correct. Don't say, "The two boys teach one another" nor "The three girls love each other."
Some handbooks and textbooks recommend that each other be restricted to reference to two and one another to reference to three or more. The distinction, while neat, is not observed in actual usage. Each other and one another are used interchangeably by good writers and have been since at least the 16th century.
Source: Merriam-Webster Dictionary
protected by Will Hunting Nov 15 '12 at 23:44
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