I was filling out an application form, when I had noticed this sentence:
If bilingual, please provide in what languages.
If I was writing this, I'd form it as which languages, instead of what languages. Is the sentence above correct?
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According to The American Heritage Dictionary entry for what, the sentence is correct.
adj. 1. which one or ones of several or many: What college are you attending? You should know what musical that song is from.
However, my preference (like yours) would be "If bilingual, please list in which languages." Just because I think it sounds better.