By which Constitutional Amendment Act was the number of Lok sabha seats increased from 525 to 545 ?

By which Constitutional Amendment Act was the number of Lok sabha seats increased from 525 to 545 ? Correct Answer Thirty-first Constitutional Amendment Act, 1973.

31st Constitutional Amendment Act, 1973 - By this amendment the seats of Lok Sabha was increased from 525 to 545 but reduced the representatior of UT's in Lok Sabha from 25 to 20.

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