All 1,2 and 3 are correct. Article 368 (1) of the Constitution of India grants constituent power to make formal amendments and empowers Parliament to amend the Constitution by way of addition, variation or repeal of any provision according to the procedure laid down therein, which is different from the procedure for ordinary legislation.Article 368 of Part XX of Indian Constitution provides for two types of amendments. Viz, By a special majority of Parliament and By a special majority of the Parliament with the ratification by half of the total states.