In general, there are almost 700 questions and more than 550 of them are unique.
No matter which certification is preferable for you (Scrum Master or Product Owner)*, you will be more confident and better prepared if you will get questions and explanations for almost all questions. And be aware that all questions are very close to real Scrum Master or Product Owner exam (but of course not exactly the same).
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Note: content on our site is not affiliated with nor endorsed by Scrum.org
Note: Based on the Scrum Guide v2017 (Nov)
* - Professional Scrum™, Professional Scrum Product Owner™, PSPO, PSPO I, PSPO 1, Professional Scrum Master™, PSM, PSM I, PSM 1, etc. is the protected brand of Scrum org.