How to change your security questions?
How to change your security questions
How to change your security questions
Give AppleCare a call, once they can verify you are who you say you are, they an reset them for you.
Click here for information. If you've forgotten the answers to the security questions and can't get them emailed to you for some reason, contact the iTunes Store staff via the link in that article.
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How to change your security questions?