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I have a friend who was an MBA teacher.
I have a friend who was an MBA teacher.
Is it a correct article?
Yes, it's correct. The rule has to do with pronunciation: if the first letter of the word is a vowel sound, then add 'an'. For example, the letter "M" is pronounced [em] (e as in egg), so 'an' is used:
Written Letters: MBA
Pronunciation: [em]BA => an [em]BA
an MBA 
Re: an MBA 
Re: an MBA 
Linear Mode
