By which Constitutional amendment, Sikkim became a new state in the Indian Union?

Question

36th, 1975 Sikkim became a state of India via the Thirty-sixth Amendment Act, 1975 on 26th April, 1975. The Sikkim State day is observed on 16th May of every year because

GKToday Admin · Accepted Answer

36th, 1975 Sikkim became a state of India via the Thirty-sixth Amendment Act, 1975 on 26th April, 1975. The Sikkim State day is observed on 16th May of every year because this was the day when the first Chief Minister of Sikkim assumed office.