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1. Any of the two books is useful.
2. Either of the two books is useful.
3. Either book is useful.

Which of the sentences is/are correct? Or are all incorrect?
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Comments  (Page 3) 
Either of the two books is useful
Either of the two books is useful' is correct because either used here as a pronoun
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2

Either of the two books is useful

Either of the two books is useful.

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