Indian Politics
The three words which were added in the preamble to the Constitution of India by the 42nd Constitutional Amendment Act 1976 are :

sovereign, secular and socialist
sovereign, secular and republic
sovereign, republic and democratic
socialist, secular and integrity

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Indian Politics
The meaning of Residuary Powers in constitution of India is-

Powers related to International issues
Powers which are not included in Union, State, and Concurrent List
Power which can be exercised by Central and State Governments
Powers related to Internal Emergency

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