LAN
How would we know? You didn't tell us what the question was.
Daniel
Most Likely Due to a Violation of the Yahoo Answers Community Guidelines
Check the Rule Book to see what you may have Done wrong if after Reading
you find you did nothing wrong then Appeal to Appeal go here
https://io.help.yahoo.com/contact/index?page=contact&locale=en_us&y=prod_answ
Select Appeals and Follow the Instructions from there
FemaleLotRfan
It was either reported as a violation or was auto deleted after a week. If you want to know why your post was removed, Just ask "How was this question (or answer) a violation?". along with what the post was and you'll know why it was reported.
Kathy
It all depends on the content of your question. If more than one person reported it, it got removed.
Anonymous
depends what the question is you gotta becare what you or else they will remove it