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1990-1992 correct for Indian politics post-independence nation building reorganization as per NCERT Politics in India.
Ref: NCERT Political Science Class XII Politics in India Since Independence Chapter 1 Nation Building explains princely states 565 integration reorganization.
Russia correct per microeconomics basics; central problems scarcity choice opportunity cost.
Ref: NCERT Economics Class XI Chapter 1 Introduction to Microeconomics explains central problems scarcity choice PPC opportunity cost concepts clearly.
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