Contact itunes store support. You cannot retrieve the answers unless you placed a rescue email on your account.
Follow these steps:
All Products and Services > iTunes > iTunes Store > Account Management > iTunes Store account security
Answer the questions and if required sign in with your Apple ID and password - same one you used to log in on this support forum.
You will find an option to send an email to Apple on that page. Indicate that you forgot the answers to your security questions and wait for iTunes support to reply.
Hope this helps you. =D