Consider the following statements with reference to the procedure for the amendment of the Constitution as laid down in Article 368:
1. The bill for constitutional amendment requires prior permission of the President for its introduction in the Parliament.
2. The bill affecting the federal provisions of the Constitution must be ratified by the state legislatures of half of the states by a special majority.
3. The President has no power to withhold his assent to a Constitutional amendment bill.
How many of the statements given above are correct?