In which Constitutional Amendment Act seats of Lok Sabha were increased from 525 to 545?

In which Constitutional Amendment Act seats of Lok Sabha were increased from 525 to 545? Correct Answer 31<sup>st</sup> Constitutional Amendment Act, 1973

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In which Constitutional Amendment Act were the seats of Lok Sabha increased from 525 to 545?
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According to which of the following constitutional amendment acts, was the number of Lok Sabha seats increased from 525 to 545?