1. The 3rd Amendment Act, 1975
  2. The 40th Amendment Act, 1976
  3. The 42nd Amendment Act, 1976
  4. The 4th Amendment Act, 1979
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1 Answers

Answer: Option 3

Preamble was amended only once in 42nd amendment act of 1976, Words 'Socialist', 'Secular' and 'Integrity' were added into preamble by this amendment act after report of Sardar Swarn Singh Committee.

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