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It does not matter if a student lives __ as ...

I'm writing a formal report. Which of the following should I use to fill in the blank? Which one is correct and more formal and looks/sounds better?

a. "on- or off-campus"

b. "on or off campus"

c. "on-campus or off-campus"

Additional question: Is a. even grammatically correct?

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No need for hyphens or anything of the like.

It doesn't matter if a student lives on or off campus...


It doesn't matter if a student lives on campus or off campus...

On a side note, it should be lives not live.

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True, we can’t all be writing King Lear. – tchrist Nov 7 '12 at 5:45

What Noah said is correct, here is why:

A hyphen is used to join two or more words to form a single adjective before a noun: On-campus library

If the compound modifiers come after a noun, they are not hyphenated: The library is on campus

The Purdue Online Writing Lab was my source for this explanation: http://owl.english.purdue.edu/owl/resource/576/01/

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Downvoter, please provide feedback. Do you believe my answer is incorrect? – Kristina Lopez Nov 7 '12 at 14:21

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