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"a" or "an" before words starting with &

Posted: Fri May 18, 2007 5:01 pm
by aerocott
Which sentences are correct?

Question 1
1. ...an n-mode instability...
2. ...a n-mode instability...

Question 2
1. An Nd:Yag laser...
2. A Nd:Yag laser...

Thank you in advance,
aerocott[/u]