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Salesforce developer certification - Is 401 mandatory for 501?

I am planning to take Salesforce developer 501 certification. Is it mandatory to take 401 before taking 501 ceritifcation. Also please suggest some workbooks for doing certifications.

Thank you all.
Yes 401(Developer) certification is required if you going to take Advanced developer certification.
Check this salesforce certification site to know more details and study guide