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Tests are hard to solve for large number of users.

Checking the similar usage of such expression, I think there is something wrong with the sentence. What's the best and correct? a large number OR large numbers OR even something else!

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These are both correct:

Tests are hard to solve for a large number of users.

Tests are hard to solve for large numbers of users.

The second sentence has a slightly more general connotation, like "users in general", whereas the first probably implies users of a specific application.

protected by user140086 Jul 1 '16 at 6:37

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