By which of the following amendments of the Indian Constitution, Sikkim became a state of India?

By which of the following amendments of the Indian Constitution, Sikkim became a state of India?

भारतीय संविधान के निम्नलिखित में से किस संशोधन द्वारा सिक्किम भारत का एक राज्य बना?

Topic : Sikkim GK