Question

under what circumstances can the president post fall vacant

Answer 1

Answer:

if president dies or fall sick then his post can fall vacant.under this circumstances

president can be elected by prime minister.

Answer 2

Explanation:

if the president of India falls sick or dies , resigns from the post or is impeached for violating the Constitution or misusing his/her power , the president's post may fall vacant. in such cases the vice president takes over as the acting president. however within six months of the date on which the vice president takes over as the acting president, the election for a new president must be held