Either of the two books is useful. No sentence is correct if it doesn't end with a punctuation mark.
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Either of the two books is useful.
No sentence is correct if it doesn't end with a punctuation mark.
anonymous
Any of the two books are useful.
Either ... (as shown above).
OR: Both (of the) books are useful.
From what you've written it's hard to say which way you're thinking of it.
CJ