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Also See: UPSC IAS Mains question papers (2016-23)
For answers keys of UPSC CSE paper 2 that is of CSAT,you can refer to the official upsc site - https://www.upsc.gov.in/examinations/answer-keys
You will get here Answer keys of various exams conducted by UPSC and also of various years.
For detailed solution you can refer to any authentic website or you can get it on question bank . I would suggest you to follow Disha publication books as it compiled the syllabus in good manner.
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